[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[Volkan Gezer]

Hello,

I am using 3.8.0.26 on Kubuntu 13.04 (KDE) Samsung Laptop and currently
using "acpi_osi=Linux acpi_backlight=vendor" to enable backlight
control. Whenever I log off, the controls are disabled again and I need
to run intel_backlight. Another problem is power profiling. Whatever I
set dimming and/or backlight off durations. It automatically turns it
off in 5 minutes (even I totally disable it).

 Do you have any idea why the problem is still not solved?

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[Luciano Dato]

Thank you Alex that worked with mine too!

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Re: [Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[AlexW]

try the whole string:

acpi_osi=Linux acpi_backlight=vendor dell_laptop.backlight=0

this worked on my Dell Studio 1558 with 3.8 kernels

Alex

On 13-04-17 09:27 PM, Luciano Dato wrote:
> Oh I forgot ls /sys/class/backlight dell_backlight  intel_backlight and
> uname -r 3.8.0-18-lowlatency as I've said before
>

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[Luciano Dato]

Oh I forgot ls /sys/class/backlight dell_backlight  intel_backlight and
uname -r 3.8.0-18-lowlatency as I've said before

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[Luciano Dato]

I'm on 13.04 beta 2 the problem persist, even adding
acpi_backlight=vendor to the boot parameters. I'm on kernel 3.8.0-18 and
a12 bios firmware version for my studio 1558

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[naveen]

Joe Maillard,

i installed using wubi , i cant find boot parameter to edit.

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[Joe Maillard]

naveen,

you need to manually set the boot parameter 'acpi_backlight=vendor'  if
you use grub as your boot manager, edit /boot/grub/grub.cfg and add the
parameter to the end of the appropriate line that begins with 'linux'.

be sure to do this whenever you get kernel updates too.

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[naveen]

uname -a

Linux ubuntu 3.2.0-23-generic #36-Ubuntu SMP Tue Apr 10 20:39:51 UTC
2012 x86_64 x86_64 x86_64 GNU/Linux


 ls /sys/class/backlight


acpi_video0  intel_backlight

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[naveen]

i installed ubuntu 12.04 , i cannot change the brightness.
my system is dell 1558.

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[Curtis Hovey]

** No longer affects: null

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[Anton Keks]

More info regarding Toshiba Satellite R830:

I can't change brightness after returning from sleep with Fn-keys, but
echoing numbers to /sys/class/backlight/intel_backlight/brightness does
change the brightness properly.

It seems that Fn keys write to /sys/class/backlight/acpi_video0/brightness, 
which doesn't do anything.
Perhaps a fix could be made in Unity (or gnome power manager) to prefer 
intel_brightness if it's available?

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[AlexW]

@cherep
On a Dell Studio 1558 with Intel HD graphics (my hardware) I still have to 
supply acpi_backlight=vendor to the kernel (both 11.10 and 12.04 beta2) -- but, 
you are right, no extra PPAs needed.

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[cherep]

@rvgsd
I think this linux-kamal-backlight PPA is not supported any longer for 10.10 
and 11.04.

Kamal suggested to update to 12.04. I've seen backlight controls work
fine under 12.04 without any PPA only after adding kernel parameters.

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[Ubuntu QA Website]

This bug has been reported on the Ubuntu laptop testing tracker.

A list of all reports related to this bug can be found here:
http://laptop.qa.ubuntu.com/qatracker/reports/bugs/568611

** Tags added: laptop-testing

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[rvgsd]

Hi,

I have a Dell Studio 1558.
uname -a : Linux mypc-Studio-1558 2.6.35-32-generic-pae #67-Ubuntu SMP Mon Mar 
5 21:23:19 UTC 2012 i686 GNU/Linux
With no boot parameters
ls /sys/class/backlight: acpi_video0
When using acpi_backlight=vendor as boot parameter: 
ls /sys/class/backlight: dell_backlight

Until the latest update i.e. 2.6.35-32, the brightness up/down was
working fine with "acpi_backlight=vendor" as the only boot parameter.
After the update, the brightness up/down doesn't work and the screen is
at full brightness. Note that I have the PAE kernel.

Help! (my eyes are burning and its exam time!!)

Thanks.!

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[valeriop]

I want to report my success in finally enabling the brightness control of my 
LCD screen on
HP Pavilion dv6-6192sl.
I make use of Debian/Sid and a custom 3.1.4 kernel. It didn't worked before 
until I modified grub and passed the
acpi_backlight=vendor
option to the kernel at boot as told in other posts.
Thank to all that contributed with their experience and to Kamal Mostafa for 
the patches to Linux.

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[Kamal Mostafa]

@cherep-

I will continue to maintain the linux-kamal-backlight PPA for Maverick
and Natty until the 12.04 release, but will likely stop maintaining it
after that time.  I encourage upgrading to Oneiric;  I think it unlikely
that the full set of backlight/brightness fixes will ever make it into
the official Ubuntu Maverick or Natty kernels at this point.

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[Kamal Mostafa]

I have updated my Ubuntu Maverick and Natty kernel PPA's with another
new experimental patch by Keith Packard[0]. This new patch may resolve
the "inverted brightness" and/or the "jumps with successive changes"
behavior that has been reported on some systems:

https://launchpad.net/~kamalmostafa/+archive/linux-kamal-
mjgbacklight

The kernels containing the new patch are tagged "~kamal4~..." (use
'uname -a' to check); they will become available within the next day. If
you experience any change in your brightness control behavior after
updating to this new version, please post a note here.

For Ubuntu Oneiric (11.10), I am maintaining a separate backlight PPA
which also now includes this new patch.   Oneiric users should see the
bug #872652 for that.

[0] http://lists.freedesktop.org/archives/intel-
gfx/2011-November/013519.html

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[cherep]

@Kamal
probably I'm only one who stuck in the past with Maverick 10.10 :) but I love 
it!  

After updating to a new kernel, I've lost the brightness control:
$ uname -r
2.6.35-31-generic
$ ls /sys/class/backlight
[empty]

Can you please update the ppa? Do you think the ppa will be maintained in the 
future for Maverick by 2012-04?
Thanks for your effort!

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[captain toro]

Please ignore my comment above. I have just tried the linux 3.1 kernel
and found both the acpi_video0 and the intel_backlight in the
/sys/class/backlight still available in debian. I thought only the
acpi_video was in the 3.0 kernel and so switched to the
kamal~mgjbacklight kernel. Maybe I will figure that out after getting
this retraction of my previous post done. I am sorry for the previous
post I just thought the intel_backlight was replaced by the acpi_video0
in all future kernels. I am very happy now with the intel_backlight
control and hope the native brightness controls are retained. Thanks
again Kamal-

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[captain toro]

Is there a way to have a finer control of the screen brightness?

I have been using the kamal~mjgbacklight kernels for
the /sys/class/backlight/intel_backlight control in my Dell
Studio 1558 since last spring. I now have the kamal~mjgbacklight
kernel in my Sony Vaio All-in-One with 22" display. Both systems
have the 1920x1080 screens and Core i3 CPU with the i915 driver and 
the Sony has the same issue with the backlight as the Dell.

Both of these systems have a blinding bright screen and
the intel_backlight control solves those problems. Now I
have tried the acpi_video0 control on the newer kernels and the
result is not good enough.

My current kernel is linux 3.0 and I have both intel_backlight and
acpi_video0. The maximum brightness on the Dell is 4882 for the
intel_backlight and 15 for the acpi_video0 except the acpi_video0
doesn't seem to work for the Dell. The Sony has maximum brightness
of 4687 with the intel_brightness and maximum of 8 with the 
acpi_video0 and both can used at the same time. Here is the problem
with the Sony:

ACPIINTEL
0   1066
1   1396
2   1874
3   2334
.
.
8   4687

The settings for acpi_video0 at 4,5,6,7 are too bright for my eyes
to check the numbers and cause a type of blindness after a while.
Most of the time I use the brightness setting of between 300 and 500
with the intel_backlight control because the setting for 0 or 1 on
the acpi_video0 control is just too bright for my eyes.

The problem is the same with Windows 7 where the minimum brightness
is too bright. I think the acpi configuration might be finding the
same settings as for Windows and that is the problem. My solution
is to continue to use the intel_backlight control from the
kamal~mjgbacklight kernel.

Am I missing something here? Are there going to be any more fixes to
the brightness control? I am about to try the linux 3.1 kernel except
doubt the acpi_video0 will give a fine enough control of the brightness.
Should I continue to use the kamal~mjgbacklight fixing kernel forever?

I really like my Dell and my Sony when using the intel_backlight
brightness control and can't stand them with the acpi_video0 control.

Double thanks for Kamal-

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[AlexW]

apologies for the noise... but since a lot of 1558 owners still get
updates on the activity of this thread:

Am I the only one who doesn't have the Standby/Hibernate capability when
logged out of the session? As in, log out of your session, close the lid
-- nothing happens; and there's no option to standby or hibernate in the
Power menu... (1558, i3, Intel, Kubuntu 11.10 64 bit fully updated).

for the record, 10.04 works as it should with Kamal's patch
(_manythanks_)

Alex

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[jhs_bg]

A BIG thank you to all involved, especially Kamal for the tremendous
efforts on this!

After one year owning that Dell Studio 1558 I finally can use linux! Freedom!
It works with "acpi_backlight=vendor dell_laptop.backlight=0".
I hated it before because it was burning my eyes with backlight to the max.

For the record, my laptop configuration is:
Intel Core i5
VGA compatible controller: Intel Corporation Core Processor Integrated Graphics 
Controller (rev 18)
Full HD display

I could not manage to get the kernel 2.x.x patched and recompiled... It was way 
easier in the old Slackware days.
Or it is just me getting old...
Anyways, I can't explain how glad I am to see kernel 3 supports the nasty Dell 
acpi!

Thank you again!
::happy face::
Ivan

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[Darren Sargent]

I just discovered something really odd, by accident: tapping the middle
"touch" button on the right of the laptop, the thing that looks like
three lines with blobs on the end meeting at a point, dims the backlight
as I want -- I can increase the brightness with Fn-F5. It's an odd key
combination but it allows me to control the brightness. Hope that helps
troubleshoot and as a workaround for others.

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[Darren Sargent]

Hi Kamal,

Thanks for your work on the backlight issue.

It was working fine for me with your PPA, until I upgraded to 11.10
(Oneiric). Now it's back to the broken behavior - stuck at maximum,
responds to the hotkeys (but only moves up or down a notch then jumps
back).

I've tried various combinations of: acpi_backlight=vendor and
dell_laptop.backlight=0 in 'grub' to no avail, including not putting
them in there (rebooting after each attempt of course).

Here's my info:

Dell XPS 17 L701X (64 bit)

$ cat /etc/issue
Ubuntu 11.10

$ ls /sys/class/backlight/
intel_backlight

$ uname -a
Linux photon 3.0.0-12-generic #20-Ubuntu SMP Fri Oct 7 14:56:25 UTC 2011 x86_64 
x86_64 x86_64 GNU/Linux

--Darren.

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[Oscar Bidabehere]

Hi, my notebook is an HP Pavilion DV7 with a Radeon Hybrid Card. I had Ubuntu 
10.04 32bits and the patch Kamal made worked for me using the following kernel 
Params:
*radeon.modeset=0 (disables radeon discrete card)
*acpi_backlight=vendor (kamal patch)

Now I updated to Ubuntu 11.10 64bits and the patch is supposed to be
already in the kernel. The problem is that if I use the second param, I
get a black screen almost all of the time, and some few times the
systems boots correctly with the brightness control working correctly.

Is there any way to solve this?

I would appreciate it very much!

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[JeanAustinR]

This fix works on my notebook, however, I noticed two things:
1. Whenever I start my computer, the brightness is at its maximum. It does not 
remember the last settings.
2. When my computer resumes from idle mode, the screen is not turned off, 
instead, brightness is at its lowest.

How do I fix it? Thanks

(Hats off to everyone for a job well done1)

By the way, my computer is HP Pavilion dv3t.

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[Kamal Mostafa]

Backlight brightness control in Ubuntu 11.10 (Oneiric) -- summary of
known remaining issues:

As noted previously, some Ubuntu 11.10 (Oneiric) systems will still need
to boot with "acpi_backlight=vendor" or some other vendor-specific boot
parameter to make the brightness up/down keys work.

Screensaver blank screen gets stuck off:   In Ubuntu 11.10 (Oneiric),
users of Dell Studio 15, Dell Studio 1558, and some other models may
experience the problem LP: #872652 ("screensaver backlight stuck off,
system looks hung").   If you find that your backlight gets stuck off
when the screensaver blanks the screen, see that bug number for the fix.

Some (all?) systems with Intel GMA4500-based graphics processors have
their brightness controls "inverted" such that the brightness-down key
increases the brightness and vice versa.   This also results in the
system starting with its brightness set to minimum (or even "off") when
the system first boots.  This problem is tracked by LP: #752165, LP:
#765438, LP: #773471.

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[AlexW]

@bond17_007: my laptop does adjust the brightness when booted with
kernel parameter "acpi_backlight=vendor". Funny thing is, neither the
brightness nor suspending on lid close work if you log out... there
isn't even an option to suspend or hibernate from the "power" menu on
the login screen...

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[bond17_007]

Thanks kamal for your work on this. 
I had this issue on Dell 1558 on ubuntu 11.04. I updated to your patch. I 
thought this was fixed on 11.10, I updated my system to 11.10 yesterday and now 
my brightness doesn't work anymore :(. The applet shows the bar but notthing 
happens on the screen. 
When I grep the "dmesg" I see following errors:
 

[   15.312411] [Firmware Bug]: ACPI: No _BQC method, cannot determine
initial brightness

Can you please let me know if you can release a patch for this or if
there is other workaround.

Thanks,

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[Kamal Mostafa]

[Oneiric Beta users]:

In Oneiric, the behavior "screen brightness keys toggle from max to min-
brightness (no steps between)" in the Unity desktop is caused by bug
827517, which is now fixed in the gnome-settings-daemon package in the
main Ubuntu archives -- but the fix didn't arrive until just after the
Oneiric Beta 1 release.   Simply updating your Oneiric system software
after installing Beta 1 should pick up the fixed gnome-settings-daemon
(version 3.1.90-0ubuntu2 or higher).

As noted previously, some Oneiric systems will still need to boot with 
"acpi_backlight=vendor" or some other vendor-specific boot parameter to make 
the brightness up/down keys work at all.  See the PPA instructions page for 
details and additional diagnostic information (even though the PPA is no longer 
needed for Oneiric systems):
  https://launchpad.net/~kamalmostafa/+archive/linux-kamal-mjgbacklight

[Natty and Maverick users]:  No news to report.

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[Adi Roiban]

Sorry for the noise.

Only now I saw comment 228.

I added dell_laptop.backlight=0 to kernel start options and it is now
working with the standard Oneiric kernel.

It was not required to use gnome-settings-daemon from the PPA.

Thanks!

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[Adi Roiban]

Tried today Oneiric with linux-image-generic 3.0.0-9.15

The screen display control turns the screnn On or OFF, there is no
intermediate brightness.

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[JeanAustinR]

Thank you Kamal (and everyone) for continuously providing help and
solution for this issue. I have one quick question. Although I don't
think it's proper to post it here but I assume it's related to the
kernel I applied via the PPA. Since installing it, my wireless is
disabled and could not be activated (as seen in the screenshot) even
when I press the Wifi button. I am using HP Pavilion dv3t, Intel.

I don't remember the changes I made but if anyone could help me figure
out which, it would be very much appreciated.

Thank you.

** Attachment added: "Wireless is disabled by hardware switch"
   
https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/568611/+attachment/2351698/+files/Sept%204%20Wireless%20Disabled.png

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[AlexW]

dell studio 1558, i3, intel graphics, oneric i386 beta daily build

booting into live environment "as is" (both Unity and KDE) -- brightness
keys don't work, brightness sliders in "settings" do nothing.

booting into live environment with "acpi-backlight=vendor" option -- in
KDE brightness works as expected (both the keys and the slider); in
Unity the keys produce "all or nothing" response, but the slider works
correctly.

too early to draw conclusions?

cheers,

alex

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[Launchpad Bug Tracker]

This bug was fixed in the package linux - 3.0.0-9.12

---
linux (3.0.0-9.12) oneiric; urgency=low

  [ Andy Whitcroft ]

  * [Config] standardise CONFIG_NETFILTER_XT_TARGET_TCPOPTSTRIP=m
  * [Config] move ECRYPT_FS back to =y for all architectures
- LP: #827197
  * record the compiler in the ABI and check for inconsistant builds

  [ Leann Ogasawara ]

  * Revert "SAUCE: OMAP: DSS2: enable hsclk in dsi_pll_init for OMAP36XX"
  * Revert "SAUCE: OMAP: DSS2: check for both cpu type and revision, rather
than just revision"
  * Revert "SAUCE: ARM: OMAP: Add macros for comparing silicon revision"
  * rebase to v3.0.2
  * rebase to v3.0.3
  * Temporarily ignore module check
  * [Config] Set CONFIG_DM_MIRROR=m on amd64, i386, and arm
  * [Config] Set CONFIG_DM_MULTIPATH=m on amd64, i386, and arm
  * [Config] Set CONFIG_DM_SNAPSHOT=m on amd64, i386, and arm
  * [Config] Enable CONFIG_EDAC_AMD8111=m on powerpc
  * [Config] Enable CONFIG_EDAC_AMD8131=m on powerpc
  * [Config] Enable CONFIG_EDAC_CPC925=m on powerpc
  * [Config] Enable CONFIG_EDAC_PASEMI=m on powerpc
  * [Config] Set CONFIG_EFI_VARS=m on amd64 and i386

  [ Stefan Bader ]

  * [Upstream] xen-blkfront: Drop name and minor adjustments for emulated
scsi devices
- LP: #784937
  * [Config] Force perf to use libiberty for demangling
- LP: #783660

  [ Stefano Stabellini ]

  * [Upstream] xen: Do not enable PV IPIs when vector callback not present
- LP: #791850

  [ Tim Gardner ]

  * [Config] updateconfigs after rebase to 3.0.2

  [ Upstream Kernel Changes ]

  * Not all systems expose a firmware or platform mechanism for changing
the backlight intensity on i915, so add native driver support.
- LP: #568611
  * rebase to v3.0.2
  * rebase to v3.0.3
 -- Leann OgasawaraMon, 15 Aug 2011 13:35:57 
-0700

** Changed in: linux (Ubuntu)
   Status: Fix Committed => Fix Released

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Re: [Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[Luciano Dato]

Great news!!! Thank's for all your work Kamal!

2011/8/17 Kamal Mostafa 

> I'm very pleased to announce that the last of Matthew Garrett's
> backlight patches has been merged into the upstream Linux tree[1] and
> the Ubuntu Oneiric kernel tree.  It should appear in the next official
> Oneiric kernel release (3.0.0-9.12).   As noted previously, some Oneiric
> systems will likely still need to boot with "acpi_backlight=vendor", and
> pending resolution of bug 827517 all Oneiric systems will still need to
> use the gnome-settings-daemon package supplied by my backlight PPA[2].
> Further small refinements (fixing the popup display behavior) are likely
> in the near future.
>
> I will be looking into the plausibility of merging the patch set into
> the official Ubuntu kernels for Natty and Maverick next, and will
> continue to support those releases via my PPA in the meantime.
>
> [1]
> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commit;h=aaa6fd2a004147bf32fce05720938236de3361d9
> [2] 
> https://launchpad.net/~kamalmostafa/+archive/linux-kamal-mjgbacklight
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/568611
>
> Title:
>  Screen brightness control fails on Dell Studio 1558
>
> Status in NULL Project:
>  Invalid
> Status in “alsa-driver” package in Ubuntu:
>  Invalid
> Status in “linux” package in Ubuntu:
>  Fix Committed
>
> Bug description:
>  Attempts (on a current Lucid beta) to control the screen brightness on
>  my Dell Studio 1558 fail with the following errors reported in dmesg:
>
>   [ 1162.236365] ACPI: Failed to switch the brightness
>   [ 1162.379144] ACPI: Failed to switch the brightness
>   [ 1162.538226] ACPI: Failed to switch the brightness
>   [ 1162.667358] ACPI: Failed to switch the brightness
>   [ 1162.784171] ACPI: Failed to switch the brightness
>
>  This is true both for the keyboard's brightness controls (Fn-F4,
>  Fn-F5) and for a gnome-brightness-applet on the panel.
>
>  Output of acpidump, dmesg and lspci is attached.
>
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>


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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[Kamal Mostafa]

I'm very pleased to announce that the last of Matthew Garrett's
backlight patches has been merged into the upstream Linux tree[1] and
the Ubuntu Oneiric kernel tree.  It should appear in the next official
Oneiric kernel release (3.0.0-9.12).   As noted previously, some Oneiric
systems will likely still need to boot with "acpi_backlight=vendor", and
pending resolution of bug 827517 all Oneiric systems will still need to
use the gnome-settings-daemon package supplied by my backlight PPA[2].
Further small refinements (fixing the popup display behavior) are likely
in the near future.

I will be looking into the plausibility of merging the patch set into
the official Ubuntu kernels for Natty and Maverick next, and will
continue to support those releases via my PPA in the meantime.

[1] 
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commit;h=aaa6fd2a004147bf32fce05720938236de3361d9
[2] https://launchpad.net/~kamalmostafa/+archive/linux-kamal-mjgbacklight

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[Leann Ogasawara]

** Changed in: linux (Ubuntu)
   Status: In Progress => Fix Committed

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[bcbc]

I've just updated on Oneiric 14R N4010. The brightness keys are now
working without any kernel boot options:

bcbc@ubuntu:~$ uname -a
Linux ubuntu 3.0.0-8-generic #11+kamal~mjgbacklight5-Ubuntu SMP Fri Aug 12 
23:53:11 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux
bcbc@ubuntu:~$ ls /sys/class/backlight
dell_backlight  intel_backlight
bcbc@ubuntu:~$ 

The only thing is that when the function keys are pressed, the popup
display show  a computer with a solid bar underneath that doesn't
change, however, if I go to System settings, Screen, the slider works
appropriately.

As far as I am concerned, this is working great. Thank you for your
effort to get this fixed and also providing the ppa's.

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[Kamal Mostafa]

I have uploaded a revised Natty kernel to the PPA, which should fix the
regression some users have reported since the last update (this revision
re-instates the enabling of acpi_backlight=vendor parameter by default).
The new 'kamal2' Natty kernel (linux -
2.6.38-11.48+kamal2~mjgbacklight5) is queued to build and should become
available within the next several hours.  Thanks Joshua, Joe, and
Lawrence for reporting and helping to diagnose the problem.

https://launchpad.net/~kamalmostafa/+archive/linux-kamal-
mjgbacklight

(Its unclear whether Oneiric also needs "acpi_backlight=vendor"; I'll
apply the same fix there if any Oneiric user of the backlight PPA
advises me that booting with that kernel parameter fixes their system).

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[Joe Maillard]

I have a fresh install on natty on my Dell Studio 1558, The brightness
keys do NOT work with the last PPA update with kernel 2.6.38-11.

If I boot with the previous kernel the brightness keys work as expected.
2.6.38-10-generic-pae #46+kamal~mjgbacklight4-Ubuntu SMP Fri Jul 15
03:10:48 UTC 2011 i686 i686 i386 GNU/Linux

I have been following your fixes since Oct when I retired my Debian
workstation and switched to using Ubuntu on my laptop.

Thanks for your ongoing help,

Joe

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[Joshua Rubin]

Using 2.6.38-11-generic #48+kamal~mjgbacklight5-Ubuntu, on a Studio
1558, the backlight keys work (I see the notification), but the
backlight levels are no longer changing.

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[Kamal Mostafa]

I have identified and fixed the cause of the "toggles backlight on or
off" problem in Ubuntu Oneiric [ reference
https://bugs.launchpad.net/ubuntu/+source/gnome-settings-
daemon/+bug/827517 ].  My backlight PPA
https://launchpad.net/~kamalmostafa/+archive/linux-kamal-mjgbacklight
now supplies a fixed gnome-settings-daemon package for Oneiric.  This
issue only affects the gnome-settings-daemon package in Gnome3, so it is
not relevant to Ubuntu Maverick or Natty.  Thanks bcbc and Jorge G for
reporting the problem.

Side note: I have also updated the gnome-power-manager package for Natty
-- just picking up the latest baseline changes.

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[Jorge G]

The hotkeys for brightness control don't work correctly. Brightness can
only be controlled using the new Screen system in the new Gnome Control
Center.

** Attachment added: "Screenshot at 2011-08-14 08:48:50.png"
   
https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/568611/+attachment/2277314/+files/Screenshot%20at%202011-08-14%2008%3A48%3A50.png

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[Jorge G]

I am on Oneiric Dell 14R N4010.


The latest kernel only allows to toggle on or off the backlight, i think it has 
something to do with the new power manager in Gnome 3. 

Would Gnome Power Manager 3 be patch against this ?

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[bcbc]

I'm running Oneiric, Dell 14R N4010
Since applying the patch, the brightness keys work, but only to toggle the 
screen off and on. 

I tried adding the boot option "dell_laptop.backlight=0" but it didn't
make a difference. Before I added that boot option I had a
dell_backlight entry in /sys/class/backlight along with intel_backlight,
but it's now I only see the intel_backlight entry.

bcbc@ubuntu:~$ uname -a
Linux ubuntu 3.0.0-8-generic #11+kamal~mjgbacklight5-Ubuntu SMP Fri Aug 12 
23:53:11 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux
bcbc@ubuntu:~$ ls /sys/class/backlight
intel_backlight
bcbc@ubuntu:~$ 

Here is the line from my grub.cfg:
linux   /boot/vmlinuz-3.0.0-8-generic root=UUID=18B4B7BBB4B799A8 
loop=/ubuntu/disks/root.disk ro   crashkernel=384M-2G:64M,2G-:128M quiet splash 
dell_laptop.backlight=0 vt.handoff=7

PS your Natty patch worked great on this computer.

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[Perry Werneck]

Hi,

Just to inform the patch is working fine in a Samsumg RV410, who was
showing a very dark screen before it.

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Re: [Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[jorgejhms]

Esta muyy bueno, que salga de una vez!!!
--
Jorge Meneses

http://jorgejhms.lamula.pe


2011/8/12 Kamal Mostafa 

> Good news to report from upstream... the last of Matthew Garrett's
> backlight brightness patches has seen some renewed activity on the
> intel-gfx mailing list[1].  I expect the latest version of the patch[2]
> (targeted for linux kernel version 3.1) to be merged into the mainline
> trees soon.
>
> I have applied this latest version of the backlight patch to my PPA
> kernels for Oneiric and Natty (Maverick still uses the older backlight
> patches).  The PPA kernels have also all been updated to the latest
> Ubuntu kernel baseline versions.  The PPA builds are in progress and
> should become available in the next several hours:
>
>
> https://launchpad.net/~kamalmostafa/+archive/linux-kamal-
> mjgbacklight
>
> My git source trees for these kernels have also all been updated (see
> the links to them on the PPA page).
>
> [1]
> http://comments.gmane.org/gmane.comp.freedesktop.xorg.drivers.intel/5368
> [2]
> http://permalink.gmane.org/gmane.comp.freedesktop.xorg.drivers.intel/5434
>
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> Title:
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>
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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[Kamal Mostafa]

Good news to report from upstream... the last of Matthew Garrett's
backlight brightness patches has seen some renewed activity on the
intel-gfx mailing list[1].  I expect the latest version of the patch[2]
(targeted for linux kernel version 3.1) to be merged into the mainline
trees soon.

I have applied this latest version of the backlight patch to my PPA
kernels for Oneiric and Natty (Maverick still uses the older backlight
patches).  The PPA kernels have also all been updated to the latest
Ubuntu kernel baseline versions.  The PPA builds are in progress and
should become available in the next several hours:

https://launchpad.net/~kamalmostafa/+archive/linux-kamal-
mjgbacklight

My git source trees for these kernels have also all been updated (see
the links to them on the PPA page).

[1] http://comments.gmane.org/gmane.comp.freedesktop.xorg.drivers.intel/5368
[2] http://permalink.gmane.org/gmane.comp.freedesktop.xorg.drivers.intel/5434

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  Screen brightness control fails on Dell Studio 1558

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[Joshua Rubin]

Yeah, I don't want to keep bugging you either, but 2.6.38-11 #48 kernel
from proposed is currently overriding the latest backlight fix kernel
(2.6.38-11 #47)

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[chamilis]

Kamal, I've seen that there haven't been updates on the patches source
code for a while, the last one is for kernel 2.6.38. Are the patches
anywhere else?

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[Drew]

Kamal, your ppa worked awesome (using Gnome3/2.6.38-10.46).

Pavilion dv6 'Quad Edition' Hybrid Graphics

Brightness controls worked on the Radeon 6740 side and Intel side.

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[Kamal Mostafa]

I have just uploaded the latest Maverick 2.6.35-30.56 and Natty 
linux_2.6.38-10.46 kernels to the PPA:
https://launchpad.net/~kamalmostafa/+archive/linux-kamal-mjgbacklight
(the packages are queued and should build some time in the next several hours).

Still no change in upstream status as of Linux 3.0-rc7.

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[Joshua Rubin]

Any news on when the #46 kernel will be built?

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[Marcin Juszkiewicz]

Also when 'asus_laptop' driver is used with 3.0-2-generic 'oneiric'
kernel I got ACPI exceptions when changing backlight level:

Jun 28 11:54:39 localhost kernel: [  612.337945] ACPI Error: Result stack is 
empty! State=880103c9ec00 (20110413/dswstate-98)
Jun 28 11:54:39 localhost kernel: [  612.337963] ACPI Exception: 
AE_AML_NO_RETURN_VALUE, Missing or null operand (20110413/dsutils-646)
Jun 28 11:54:39 localhost kernel: [  612.337975] ACPI Exception: 
AE_AML_NO_RETURN_VALUE, While creating Arg 1 (20110413/dsutils-763)
Jun 28 11:54:39 localhost kernel: [  612.337987] ACPI Error: Method 
parse/execution failed [\_SB_.PCI0.VGA_.DWBL] (Node 880138e38578), 
AE_AML_NO_RETURN_VALUE (20110413/psparse-536)
Jun 28 11:54:39 localhost kernel: [  612.338009] ACPI Error: Method 
parse/execution failed [\_SB_.PCI0.SBRG.EC0_._Q0E] (Node 880138e3fca8), 
AE_AML_NO_RETURN_VALUE (20110413/psparse-536)


Jun 28 11:54:42 localhost kernel: [  615.157385] ACPI Error: Result stack is 
empty! State=880103c9f400 (20110413/dswstate-98)
Jun 28 11:54:42 localhost kernel: [  615.157403] ACPI Exception: 
AE_AML_NO_RETURN_VALUE, Missing or null operand (20110413/dsutils-646)
Jun 28 11:54:42 localhost kernel: [  615.157415] ACPI Exception: 
AE_AML_NO_RETURN_VALUE, While creating Arg 1 (20110413/dsutils-763)
Jun 28 11:54:42 localhost kernel: [  615.157428] ACPI Error: Method 
parse/execution failed [\_SB_.PCI0.VGA_.UPBL] (Node 880138e38550), 
AE_AML_NO_RETURN_VALUE (20110413/psparse-536)
Jun 28 11:54:42 localhost kernel: [  615.157450] ACPI Error: Method 
parse/execution failed [\_SB_.PCI0.SBRG.EC0_._Q0F] (Node 880138e3fcd0), 
AE_AML_NO_RETURN_VALUE (20110413/psparse-536)

No such messages when intel_backlight is used.

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[Marcin Juszkiewicz]

Asus UL30A again.

11:40 root@lumpek:intel_backlight# uname -a
Linux lumpek 2.6.38-10-generic #44+kamal~mjgbacklight4-Ubuntu SMP Mon Jun 6 
19:40:12 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux

/sys/class/backlight/
11:38 hrw@lumpek:backlight$ ll
razem 0
lrwxrwxrwx 1 root root 0 2011-06-28 11:36 asus_laptop -> 
../../devices/platform/asus_laptop/backlight/asus_laptop
lrwxrwxrwx 1 root root 0 2011-06-28 11:36 intel_backlight -> 
../../devices/pci:00/:00:02.0/drm/card0/card0-LVDS-1/intel_backlight


11:42 root@lumpek:intel_backlight# cat /proc/cmdline 
BOOT_IMAGE=/vmlinuz-2.6.38-10-generic root=/dev/mapper/lucek-rootfs ro 
loop.max_loop=256 loglevel=9

After removing 'asus_laptop' module I had backlight working fine with
your kernel. With oneiric kernel I have backlight working fine with
asus_laptop module loaded.

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Re: [Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[jorgejhms]

Could you send the link for the bug upstream? Thanks!
--
Jorge Meneses

http://jorgejhms.lamula.pe


2011/6/21 Kamal Mostafa 

> Upstream status of the patch set: No change in status as of upstream
> Linux v3.0-rc4  We are still (yes, still!) waiting for one critical
> patch to be applied to the upstream linux kernel before we can integrate
> this functionality into the main Ubuntu kernel. Until such time, I will
> continue to maintain up-to-date Maverick and Natty kernels including the
> patches at the PPA linked above.
>
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>
> Title:
>  Screen brightness control fails on Dell Studio 1558
>
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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[Kamal Mostafa]

Upstream status of the patch set: No change in status as of upstream
Linux v3.0-rc4  We are still (yes, still!) waiting for one critical
patch to be applied to the upstream linux kernel before we can integrate
this functionality into the main Ubuntu kernel. Until such time, I will
continue to maintain up-to-date Maverick and Natty kernels including the
patches at the PPA linked above.

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[Jean-Sébastien Gosselin]

@Barry Lennon

Hello Barry. Here is what I did to install this ppa: I  added it to my
software sources in update manager (in "other software" tab), than ran
an update of my system (also in update manager) and it installed
everything all by itself.

I also suggest you read this:
https://launchpad.net/~kamalmostafa/+archive/linux-kamal-mjgbacklight

It will probably help you determine if this ppa is well suited for your
system.

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[Barry Lennon]

I'm a complete newcomer to Ubuntu (and Linux in general), but I can
immediately see the improvements in using my netbook with it over Win7.

That said, I'm having the same display brightness problems as above.

I can use the workaround for "setpci", but I can't get the PPA working.
It shows up as an entry named "linux-kamal-mjgbacklight" in the Ubuntu
Software Centre application, but the "intel_backlight" entry isn't there
when I run $ ls /sys/class/backlight (there's nothing in there now - it
used to list the default).

I'm using a Samsung N210.  The output for $ uname -a is "Linux Samtu
2.6.38-8-generic #42-Ubuntu SMP Mon Apr 11 03:31:50 UTC 2011 i686 i686
i386 GNU/Linux".

Am I even meant to be using this patch on this machine??  Any help
gratefully received.

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[Andrea V]

@Kamal Mostafa: any mainline-related updates?

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[Jean-Sébastien Gosselin]

On a Laptop Dell Inspiron 14R with Ubuntu 11.04 64bit, blacklight
control is working as intended with the patched kamal mostafa kernel.
Thank you very much.

I had similar issue though with the screen lock when returning from
suspension or from screen saver; my screen was randomly freezing, but I
was able to move the mouse around. I had to Ctrl-Alt F2 and "sudo pkill
X" in order to have it back.

I deactivated in CompizConfig Settings Manager>General>OpenGL>Sync To
VBlank and the issue seems to be resolved.

JS

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[Helias Fotiadis]

I have an emachines E525 laptop and I have been experiencing problems with my 
screen backlight since I installed Natty.
I have installed the patched kamal mostafa kernel and my  problem symtoms now 
are:
1)  no backlight at startup but fixable with the hotkeys
2) the inverted hotkeys.
3) the comptuter cannot be controlled when I return from suspension, showing me 
a black (but with brightness active) screen with the mouse pointer swimming in 
it aimlessly or showing nothin at all, making me to press and hold the power 
button down to restart the computer. Rarely, though, it works fine. But realy 
rarely. This is not the case with hibernation, however, which works fine.
AND
3)when I use the laptop battery to turn my computer on the backlight is off 
during the "Ubuntu" starting/welcoming screen as always but just before that 
screen switches to my desktop screen the backlight is on and I can see the 
starting screen (only briefly) and then my desktop screen. However, this is NOT 
happening when the laptop is on main power source whether it is only main or I 
recharge the battery. This is happening only on battery alone. Also when I 
press the brightness hotkey it shows me that the brighness bar is halfway full.
Now, when I use the i915.alse_backlight=1 parameter on GRUB the following 
happen:
1) I have full brightness from the beginning, no problems at all with that.
2) the hotkeys for brightness don't work.
3) the return from suspension still messes up my computerhibernation works 
fine.
4) whether the power source is main or battery or both it does't make any 
difference.
5) the screen is somewhat messed up meaning that it's annoyingly wide.

On all cases, closing the lid makes no problems because I have changed
the option so the computer does nothing when I close the lid.

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[JeanAustinR]

Is there a way like somehow apply it to Fedora 15? Something like a
conversion tool from deb to rpm?

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[Marcin Juszkiewicz]

ASUS UL30A running oneiric with 2.6.38-9-generic amd64 kernel:

[0.00] Linux version 2.6.38-9-generic (buildd@king) (gcc version
4.5.2 (Ubuntu/Linaro 4.5.2-8ubuntu4) ) #43+kamal~mjgbacklight4-Ubuntu
SMP Fri Apr 29 04:33:59 UTC 2011 (Ubuntu
2.6.38-9.43+kamal~mjgbacklight4-generic 2.6.38.4)

Pressing Fn+F6 (Brightness Up) is catched by XFCE and notification for
brightness up is shown. But brightness does not change and kernel says:

[  803.043216] ACPI Error: Result stack is empty! State=880134fc4800 
(20110112/dswstate-98)
[  803.043236] ACPI Exception: AE_AML_NO_RETURN_VALUE, Missing or null operand 
(20110112/dsutils-646)
[  803.043247] ACPI Exception: AE_AML_NO_RETURN_VALUE, While creating Arg 1 
(20110112/dsutils-763)
[  803.043261] ACPI Error: Method parse/execution failed [\_SB_.PCI0.VGA_.UPBL] 
(Node 880137638550), AE_AML_NO_RETURN_VALUE (20110112/psparse-536)
[  803.043284] ACPI Error: Method parse/execution failed 
[\_SB_.PCI0.SBRG.EC0_._Q0F] (Node 88013763fcd0), AE_AML_NO_RETURN_VALUE 
(20110112/psparse-536)

On Fn+F5 (Brightness Down):

[  833.535486] ACPI Error: Result stack is empty! State=88012f7c7800 
(20110112/dswstate-98)
[  833.535505] ACPI Exception: AE_AML_NO_RETURN_VALUE, Missing or null operand 
(20110112/dsutils-646)
[  833.535517] ACPI Exception: AE_AML_NO_RETURN_VALUE, While creating Arg 1 
(20110112/dsutils-763)
[  833.535531] ACPI Error: Method parse/execution failed [\_SB_.PCI0.VGA_.DWBL] 
(Node 880137638578), AE_AML_NO_RETURN_VALUE (20110112/psparse-536)
[  833.535554] ACPI Error: Method parse/execution failed 
[\_SB_.PCI0.SBRG.EC0_._Q0E] (Node 88013763fca8), AE_AML_NO_RETURN_VALUE 
(20110112/psparse-536)

Now I have two backlight interfaces:

17:01 root@lucek:backlight# ls -l
razem 0
lrwxrwxrwx 1 root root 0 2011-05-20 16:47 asus_laptop -> 
../../devices/platform/asus_laptop/backlight/asus_laptop
lrwxrwxrwx 1 root root 0 2011-05-20 16:47 intel_backlight -> 
../../devices/pci:00/:00:02.0/drm/card0/card0-LVDS-1/intel_backlight

Removing of asus-laptop module gave me black screen with no backlight at
all. Loading it back does not change situation.

Amount of possible step for intel_backlight scares me:

17:03 root@lucek:intel_backlight# cat max_brightness 
1992060

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[aaronchall]

I have the studio 1558, brightness control problem going on.

I added the repository with: 
sudo add-apt-repository ppa:kamalmostafa/linux-kamal-mjgbacklight/ppa

Then I did:
sudo apt-get update

It still wouldn't work, so I ran this: 
sudo apt-get dist-upgrade

I guess I'll reboot, and see if it works.

Aaron

PS I noticed I could "manually" add the ppa with this:
deb http://ppa.launchpad.net/kamalmostafa/linux-kamal-mjgbacklight/ubuntu 
maverick main 
deb-src http://ppa.launchpad.net/kamalmostafa/linux-kamal-mjgbacklight/ubuntu 
maverick main 

How is that different from what I've done?

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[abuaz...@gmail.com]

when I use $ lsmod | grep ^i915 in terminal it shows command not found


Linux ubuntu 2.6.39-0-generic #5~20110427-Ubuntu SMP Wed Apr 27 15:27:41 UTC 
2011 x86_64 x86_64 x86_64 GNU/Linux

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[Andrea V]

I've discovered a slight difference with i915.alse_backlight=1:
the actions over the intel_backlight interface (script associated with key 
combination [ echo NUM >intel_backlight ]) can reestablish a correct screen 
brightness while without that kernel parameters, those same actions, seem to be 
ignored!

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[Andrea V]

i915.alse_backlight=1 doesn't have any significant effect for me.
Brightness can be lightened on again only with hotkeys 
(brightness_workaraound.pl script associated to Fn Keys).

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[Wolfgang Kufner]

i915.alse_backlight=1 result:
no more hotkeys (full bright, which is always the default)
immediately bright again after lid open (instead of black that I can regulate 
up with hotkeys)
/sys/class/backlight/ empty (instead of intel_backlight without parameter)
also:
unknown parameter i915.alse_backlight at bootup
screen resolution is much lower

with:
Acer Extensa 5635Z from bug 518002 and comment 190
maverick with patched 2.6.38-9 and xorg-edgers

Thanks

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[Peter-jezdec]

Apparently, the update from maverick to natty caused Gnome power
management to be removed. I installed it, and now the power keys, etc.
work.

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[Peter-jezdec]

Hi, I have a dell inspiron N7010, and this PPA fixed my backlight
problem in Maverick; however, not in natty. The backlight interface is
created, but is not controled by Gnome 2.32.1.

uname -a
Linux Rebuild 2.6.38-9-generic #43+kamal~mjgbacklight4-Ubuntu SMP Fri Apr 29 
04:33:59 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux

with dell_laptop.backlight=0
ls /sys/class/backlight/
intel_backlight

without dell_laptop.backlight=0
ls /sys/class/backlight/
dell_backlight  intel_backlight

if I write a value to /sys/class/backlight/intel_backlight/brightness,
the backlight does change

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[Kamal Mostafa]

Addressing several recent posts regarding the linux-kamal-mjgbacklight PPA:
https://launchpad.net/~kamalmostafa/+archive/linux-kamal-mjgbacklight

A few of you have reported problems with the backlight not coming back
on after power management / lid events (or after 'xset dpms force
off')...   It is not clear whether this problem is specific to the
linux-kamal-mjgbacklight PPA kernel or a new problem introduced in the
mainline 11.04 kernel (as suggested by bug 765438).  Those experiencing
this problem:  Please advise whether booting with the parameter
"i915.alse_backlight=1" affects it (and also whether that parameter
adversely affect the normal backlight control, which it might).

The "inverted brightness controls" problem reported on some Acer systems
(Acer TravelMate, Acer eMachines G525) is a known issue and is being
investigated.

Some users have asked whether these backlight patches can be applied to
Ubuntu 10.04 (Lucid):  No.  The linux-kamal-mjgbacklight PPA is only
applicable to Ubuntu 10.10 (Maverick) and Ubuntu 11.04 (Natty).  I do
not expect that this work will be ported to Lucid or earlier releases
due to technical incompatibilities.

Upstream status of the patch set:  We are still waiting for one
(critical) patch to be applied to the upstream linux kernel before we
can integrate this functionality into the main Ubuntu kernel.  Until
such time, I will continue to maintain up-to-date Maverick and Natty
kernels including the patches at the PPA linked above.

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  Screen brightness control fails on Dell Studio 1558

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[Kenneth Thorell]

Hi all
I used this 
"https://launchpad.net/~kamalmostafa/+archive/linux-kamal-mjgbacklight";
to mi  Acer eMashines G525 and it works but the LCD brightness is going 
backwords
So i set my LCD brightness to 3 % and then itś working

this is from the bug report 
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/765438
 hope that you can patch a new file with the LCD light going in the right way

"i don t know how to use "uname -a" and copying it to this"

But is a ACER eMashines G525 runing 64 bit 11.04

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[JeanAustinR]

The temporary workaround works for HP Pavilion dv3-2016t running Ubuntu
11.04. Thank you!

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[Wolfgang Kufner]

Correction for comment 188: With the Extensa from bug 518002 the problem
is just that after lid close or xset dpms force off the backlight does
not come on again with any keypress like it should. Instead I have to
use the hotkeys to up the brightness from zero to what I want. Which is
kind of annoying since it is every time after a lid close. Still, way
less severe than I mistakenly thought.

Correction for comment 189: With the Acer from bug 773471 everything
works.

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[Wolfgang Kufner]

Another user (bug 773471 comment 15) reports yet different strange side 
effects: It only works till he moves the mouse.
quote:
>yes till the first mouse move...the backlight hotkeys worki can bring it 
>back with setpci...its ok for me to close the lid and after >xset dpms force 
>off, press a key is enough, brightness comes back!

uname -a
Linux chris-Aspire-5732Z 2.6.38-9-generic #43+kamal~mjgbacklight4-Ubuntu SMP 
Fri Apr 29 04:31:32 UTC 2011 i686 i686 i386 GNU/Linux

ls /sys/class/backlight
intel_backlight

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[Wolfgang Kufner]

Same problem. The patched kernel makes backlight control work again on
an Acer Extens 5635Z (bug 518002), but if I close the lid it does not
come back on again. Not even with setpci. Tested with both kernels on
maverick.

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[Andrea V]

I've noticed a bug with the 2.6.38 patched kernel:
when the backlight is powered off by a power managemente agent, it can't be 
lightened on again!
Also with:

$ xset dpms force off

turns the screen off but it cannot be lightened back! The computer still
perfectly working, but no screen!

With vanilla the problem doesn't present itself.

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[Rodrigo M. R. Avila]

Hi Kamal,

still doesn't work for me. I have an Acer travelmate 4230-6704 and can't
change lcd brigthness. My Fn key is not working too (keyboard problem).

tried
echo -n 100 > /proc/acpi/video/VGA/LCD/brightness
sudo setpci -s 00:02.0 F4.B=FF

I'm using
Ubuntu Natty with gnome-power-manager version 
2.32.0-2ubuntu2+kamal~backlight2~n and linux kernel 
2.6.38-8.41+kamal~mjgbacklight3.

lspci
00:00.0 Host bridge: Intel Corporation Mobile 945GM/PM/GMS, 943/940GML and 
945GT Express Memory Controller Hub (rev 03)
00:02.0 VGA compatible controller: Intel Corporation Mobile 945GM/GMS, 
943/940GML Express Integrated Graphics Controller (rev 03)
00:02.1 Display controller: Intel Corporation Mobile 945GM/GMS/GME, 943/940GML 
Express Integrated Graphics Controller (rev 03)

lsmod | grep ^i915
i915  515415  3 

rodmra@tm4230:/proc/acpi$ ls
ac_adapter  battery  button  event  wakeup

rodmra@tm4230:/sys/class/backlight$ ls
intel_backlight

rodmra@tm4230:/sys/class/backlight/intel_backlight$ ls
actual_brightness  brightness  max_brightness  subsystem  uevent
bl_power   device  power   type

Thanks.

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[Mark Huijgen]

Hi Kamal,

Your patched kernel allows brightness control to work on a new Medion
Akoya E7216 laptop where the ACPI brightness implementation fails, so
thats great! Thanks for the work you have done to make this work on this
system.

However I would like to use the same kernel also another range of
systems and these systems need the acpi_video method to control the
backlight. This gets completely disabled at the moment because of the
forced acpi_video=vendor in drivers/acpi/video_detect.c. The system in
question does register an msi-wmi backlight handler now with this new
kernel, but this one is not working, only the acpi_video method works on
this system.

Is there a way to get brightness controls working on both systems
without using different kernel boot parameters? So the intel stystem
using intel_backlight (and not the acpi_video) and the other system
using acpi_video (and not msi-wmi)?

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[Nicholas Peralta Leon]

Dear Kamal

how could I change the contrast of my screen  directly in the driver
using something like :

echo "value" > / driver/..

or any other  sentence, I propose this like a solution quick because my
studio don't allows a upgrade right now until the vacations. My laptot
is a dell studio 1558 runing in lucid lynx with linux 2.6.32.30

Thanks .

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[Sarwagya Pandey]

@kamal,

I am using Ubuntu Lucid 10.04 in my Dell studio 1558 and having the same
problem with my brightness controls not working.

I tried to follow the steps that you mentioned but seems like I lost
somewhere.

Here is what I did. Can you please tell me where things went wrong?

1) First downloaded the *.deb files from this url
http://kernel.ubuntu.com/~kamal/i915_brightness/latest-lucid/
2) Ran this command: sudo dpkg -i linux*kamal*.deb
Only the linux...all.deb file ran successfully. Other files gave this error 
package architecture (amd64) does not match system (i386)

3) After reboot, output of "dmesg | grep backlight" gives nothing.

I am kind of a newbie and just know basic scripting. So can you please
guide me in detail how to fix this problem please.

Thanks.

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Re: [Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[jorgejhms]

I'm sorry, I mean this bug
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/656745
--
Jorge Meneses

http://jorgejhms.lamula.pe


2011/4/5 jorgej...@gmail.com 

> Dear Kamal, many of us can't upgrade because of this bug
> https://bugzilla.redhat.com/show_bug.cgi?id=624212.
> Could't be another option for Lucid users?
> --
> Jorge Meneses
>
> http://jorgejhms.lamula.pe
>
>
>
> 2011/4/5 Kamal Mostafa 
>
>> @AndreaV - Thanks for contributing those scripts!
>>
>> @adam - its unlikely that the backlight brightness patch would affect
>> the boot time of your Natty system -- its possible that the issue you're
>> experiencing relates to something else in the (fast moving) Natty beta
>> kernel.  If you can determine whether the problem you're seeing is
>> actually specific to the backlight PPA versus the same (non-PPA) version
>> of the Natty kernel, please let me know (you can use 'uname -a' to
>> examine the exact versions of the kernel's you're using).
>>
>> @Hendy, @Prateek - I understand that the PPA doesn't provide a fully
>> functional solution for KDE yet.  I will be re-examining the KDE
>> situation soon.
>>
>> @Nicholas - The PPA is suitable for Ubuntu Maverick and Natty (but not
>> for Lucid, which you appear to be running).  You'll have to upgrade to
>> Maverick if you wish to use the PPA.
>>
>> --
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>> Title:
>>  Screen brightness control fails on Dell Studio 1558
>>
>> To unsubscribe from this bug, go to:
>> https://bugs.launchpad.net/null/+bug/568611/+subscribe
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>
>

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[jorgejhms]

Dear Kamal, many of us can't upgrade because of this bug
https://bugzilla.redhat.com/show_bug.cgi?id=624212.
Could't be another option for Lucid users?
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http://jorgejhms.lamula.pe


2011/4/5 Kamal Mostafa 

> @AndreaV - Thanks for contributing those scripts!
>
> @adam - its unlikely that the backlight brightness patch would affect
> the boot time of your Natty system -- its possible that the issue you're
> experiencing relates to something else in the (fast moving) Natty beta
> kernel.  If you can determine whether the problem you're seeing is
> actually specific to the backlight PPA versus the same (non-PPA) version
> of the Natty kernel, please let me know (you can use 'uname -a' to
> examine the exact versions of the kernel's you're using).
>
> @Hendy, @Prateek - I understand that the PPA doesn't provide a fully
> functional solution for KDE yet.  I will be re-examining the KDE
> situation soon.
>
> @Nicholas - The PPA is suitable for Ubuntu Maverick and Natty (but not
> for Lucid, which you appear to be running).  You'll have to upgrade to
> Maverick if you wish to use the PPA.
>
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> Title:
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>
> To unsubscribe from this bug, go to:
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>


** Bug watch added: Red Hat Bugzilla #624212
   https://bugzilla.redhat.com/show_bug.cgi?id=624212

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[Kamal Mostafa]

Upstream status:

I am happy to report that most of the core backlight brightness patches
we've been waiting for (Matthew Garrett's work) have been integrated in
the the mainline Linux 2.6.39 kernel source repository.  This means that
the new "intel_backlight" functionality will now get the necessary
testing coverage required before we can pull them in to the official
Ubuntu kernel.  (One necessary patch has not yet been integrated; I am
working with the author to get that missing piece resolved.)

Ubuntu Natty 11.04 (which includes kernel version 2.6.38) will *not*
include these patches at release, a few weeks away.  I will be working
on getting these latest mainline patches backported, aiming to get them
included in an official Stable Release Update kernel for Natty (and
Maverick, hopefully).

I will continue to maintain the PPA
https://launchpad.net/~kamalmostafa/+archive/linux-kamal-mjgbacklight
for Natty and Maverick in the meantime.

Thanks again to everyone who has provided testing feedback.

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[Kamal Mostafa]

@AndreaV - Thanks for contributing those scripts!

@adam - its unlikely that the backlight brightness patch would affect
the boot time of your Natty system -- its possible that the issue you're
experiencing relates to something else in the (fast moving) Natty beta
kernel.  If you can determine whether the problem you're seeing is
actually specific to the backlight PPA versus the same (non-PPA) version
of the Natty kernel, please let me know (you can use 'uname -a' to
examine the exact versions of the kernel's you're using).

@Hendy, @Prateek - I understand that the PPA doesn't provide a fully
functional solution for KDE yet.  I will be re-examining the KDE
situation soon.

@Nicholas - The PPA is suitable for Ubuntu Maverick and Natty (but not
for Lucid, which you appear to be running).  You'll have to upgrade to
Maverick if you wish to use the PPA.

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[Nicholas Peralta Leon]

Hi Kamal

I'm try to installing PPA dedicated to dell studio 15xx in my studio
1558 but when I try to download sources the update manager says;

Failed to fetch 
http://ppa.launchpad.net/kamalmostafa/linux-kamal-mjgbacklight/ubuntu/dists/lucid/main/binary-i386/Packages.gz
  404  Not Found
Some index files failed to download, they have been ignored, or old ones used 
instead.

I'm trying to change of a another server without result

My location is in south america exactly in colombia.

thanks

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[Hendy Irawan]

Dear Kamal,

Could you please also look at Bug #538256 ?

It's the exact same issue but for Lenovo IdeaPad net/notebooks including
Z360.

Your kernel PPA works but only in GNOME. I use Ubuntu Maverick 10.10 +
KDE 4.6.0 from KDE PPA and brightness control doesn't work at all.

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[adam christopher]

My Acer Aspire 5734 laptop had this problem upon upgrading to Natty beta
1.  The above patch worked, but the display still shuts off (not just
black with a cursor) for a full 30 seconds during boot.  Pre-dist-
upgrade I was booting in 30 secs total.  I can only hope this will get
better?

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[Andrea V]

Thanks KAMAL!

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[Andrea V]

Just patched a vanilla 2.6.38 kernel on dell laptop XPS 15 running Slackware 
13.37.
The intel_brightness interface works great!
Just to let it be used within kde I've written two trivial utilities:

brightness_workaround.pl

#!/usr/bin/perl

open(ACTUAL, "/sys/class/backlight/intel_backlight/actual_brightness");
$ag = ;
close(ACTUAL);
$step = ($ARGV[1]) ? $ARGV[1] : 400;
$ag += ($ARGV[0] eq '-') ? -$step : $step;
system("/bin/echo $ag >/sys/class/backlight/intel_backlight/brightness");


brightness_workaround_wrapper (setuid'ed)

#include 

int main(int argc, char **argv) {
setuid(0);
execv("/usr/local/bin/brightness_workaround", argv);
}


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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[The Amigo]

Thank you very much, Kamal!

This fixes the backlight controls on my Dell Studio 1558 (Core i5
integrated GPU).  I run ArchLinux, but the patch applied to a vanilla
2.6.38 kernel without issue and works great.

Here's to hoping that it makes it in 2.6.39 mainline.

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[Prateek Karandikar]

I have the same issue on my Dell Inspiron 14 R (N4010), on Kubuntu 10.10
64-bit, with the 2.6.35-27-generic kernel, i915 kernel module for
graphics. I can move the brightness slider in the battery applet but
that has no effect on the brightness. Will this be fixed in 11.04?

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Re: [Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[jorgejhms]

Dear Kamal,

This PPA also fix this bug 
https://bugs.launchpad.net/ubuntu/+source/pm-utils/+bug/656745
This is the only reason I'm restraining myself to upgrade to maverick 
and staying in lucid, being unable to use your pacth...

Regards!

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[Kamal Mostafa]

My backlight PPA at https://launchpad.net/~kamalmostafa/+archive/linux-
kamal-mjgbacklight has been updated with a revised version of the
experimental backlight control patches.

This version also includes various upstream Intel GPU driver changes,
and sets the kernel parameter "acpi_backlight=vendor" internally (there
is no longer any need to set the parameter to enable the new
intel_backlight functionality).  A couple of additional kernel boot
parameters have also been added for testing/troubleshooting purposes --
see the updated notes on the PPA page for details.

The PPA supports Ubuntu Maverick (10.10) and Ubuntu Natty (11.04 alpha).
   *[pending resolution of a build problem with the Natty version]

Users who experience any problems with the PPA version contact me or
post here.

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[Kamal Mostafa]

Good questions, Andy.

> Can I ask what the upstream status of these patches are?

Upstream status:  Unfortunately, the core patches which enable the new
intel_backlight did not make it into the upstream Linux 2.6.38 mainline
kernel (soon to be released).  The patches will likely get re-submitted
for consideration for the next mainline kernel version.  I will continue
to encourage the upstream teams to finalize and adopt the patches.

> So what's the holdup?  Why isn't this in mainline, or at the very
least in Ubuntu's default kernel?

Ubuntu status: While it is true that many of us have had successful
results with my PPA, the patch set (as backported to Maverick at least)
is known to cause regressions on a few systems.  I do not feel that
these patches are suitable for inclusion in the Ubuntu main kernel yet.
After they (eventually) land in the Linux mainline kernel I expect that
they will stabilize quickly, and at that time I will port and propose
them for inclusion in all the currently supported Ubuntu versions.

In the meantime, I will continue to maintain my PPA, which I update regularly 
to reflect new variants of the core backlight patch set and other related 
brightness control fixes:
https://launchpad.net/~kamalmostafa/+archive/linux-kamal-mjgbacklight

Thanks for your continued patience folks.

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Re: [Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[jorgejhms]

Yeah, it should be included at least in the Ubuntu kernel version, or 
have a special PPA with the pach. I think there are other issues with 
Dell machines in a PPA but there isn't available for Lucid.

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[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558

[Andy Ross]

Can I ask what the upstream status of these patches are?  I just had to
replace my (broken, and now out of production) 1558 with a new Arrandale
laptop (a Dell L501X / "XPS 15"), and was amused to discover that it,
too, needs the intel_backlight patch.

This has been a long-standing issue, spanning three Ubuntu versions
(including Natty) and 7 kernel releases.  It affects *many* machines,
and given the crushing weight of the comments in this thread appears to
have had very extensive testing.

So what's the holdup?  Why isn't this in mainline, or at the very least
in Ubuntu's default kernel?

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https://bugs.launchpad.net/bugs/568611

Title:
  Screen brightness control fails on Dell Studio 1558

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