*** This bug is a duplicate of bug 765438 ***
https://bugs.launchpad.net/bugs/765438
As expected this bug also impacts Mint, beginning with Mint 10 and on
and on and on. Nine worked.
Just in case it might help, when using an external monitor, opening a
video file in most players or video
*** This bug is a duplicate of bug 765438 ***
https://bugs.launchpad.net/bugs/765438
I've stopped using Ubuntu now since this bug first appeared I refuse
to use a system that needs hacks to work.
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*** This bug is a duplicate of bug 765438 ***
https://bugs.launchpad.net/bugs/765438
** This bug has been marked a duplicate of bug 765438
On startup, the backlight is off on laptop
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I have Acer Aspire 4736z and I have tried Ubuntu 11.10 and 12.04 and
this bug is still present. I have used OpenSUSE and Linux Mint 13 and
it's also there. I hope somebody finds a permanent fix.
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@ Anthony Lorenzo: Bury your hope :-((
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/910536
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/744187
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/752165
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/765438
Bug is still present on ubuntu kernel 3.2.0-24 (generic, 64bit)
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Title:
No backlight display Acer Aspire 5734Z
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Bug still present on Ubuntu 12.04 Beta2.
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Title:
No backlight display Acer Aspire 5734Z
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** Changed in: linux (Ubuntu)
Importance: Undecided = High
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Title:
No backlight display Acer Aspire 5734Z
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I have the same problem with the notebook Acer TravelMate 5735Z.
Using the Live-CD of Natty or Oneiric, I boot into a black screen (no
backlight). The described workaround in #33 (see posting obove) works
fine. But I hope there will be a bugfix soon, because using the control
keys after every
I found a temporary fix that works very well. It is not perfect, but it
is far better, and far more convenient, than the setpci fix. With this
fix, the backlight does not automatically come on, but it makes the
brightness control keys functional again, and will turn on the backlight
with just a
This is still affecting the most current release, I am on an emachines
E725 laptop, which is made by Acer. I hope this bug gets fixed soon. I
have found a fix in the past and I will try it again. I will report back
to this thread later.
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** Changed in: linux (Ubuntu)
Status: Triaged = Confirmed
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Title:
No backlight display Acer Aspire 5734Z
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THIS SOLUTION WORKS:
http://ubuntuforums.org/showthread.php?t=1743301
READ UNKNOWN 47'S ANSWER!!!
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Title:
No backlight display Acer Aspire
Benat:
That solution works (or worked) in some cases, but not all - does it
work for you when resuming from suspend/hibernate? For many it does not
(or did not, in an older version of the kernel).
What version of the kernel are you claiming success with?
Thanks
Doug
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** Changed in: linux (Ubuntu)
Status: Confirmed = Triaged
** Tags added: kernel-bug-exists-upstream
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Title:
No backlight display Acer
I assume the conversation here is related?
https://lkml.org/lkml/2011/6/15/369
Travis, is there any way for you identify the bug # upstream so I can
follow it and determine when to bother re-testing this on my
distributions?
Thanks,
Doug
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Tried the kernel you specified. The problem still exists.
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Title:
No backlight display Acer Aspire 5734Z
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This bug is upstream. It affects all distributions with kernel 2.6.38
and up. It is due to a specific module i915. This is the driver for
various Intel based graphics adapters.
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I've installed the latest mainline kernel from the URL below and
verified the bug still exists.
http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.0.7-oneiric/
If that's not the right kernel to use, please point me in the right
direction. I'm happy to help but am new to this process.
** Changed
@Douglas,
Can you try the kernel available at:
http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.1-rc10-oneiric/
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Title:
No backlight display
I've verified that this bug still exists in the release version of
Ubuntu 11.10.
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Title:
No backlight display Acer Aspire 5734Z
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** Changed in: linux (Ubuntu)
Status: Incomplete = Confirmed
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Title:
No backlight display Acer Aspire 5734Z
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Thank you for taking the time to file a bug report on this issue.
However, given the number of bugs that the Kernel Team receives during
any development cycle it is impossible for us to review them all.
Therefore, we occasionally resort to using automated bots to request
further testing. This is
Thank you for taking the time to file a bug report on this issue.
However, given the number of bugs that the Kernel Team receives during
any development cycle it is impossible for us to review them all.
Therefore, we occasionally resort to using automated bots to request
further testing. This is
I have officially divorced myself from the Ubuntu community. I will no
longer be assisting in the work on this bug. Since this bug is also
affecting the Fedora project, I have decided to direct my efforts
towards it, instead.
** Changed in: linux (Ubuntu)
Status: Incomplete = Confirmed
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Thank you for taking the time to file a bug report on this issue.
However, given the number of bugs that the Kernel Team receives during
any development cycle it is impossible for us to review them all.
Therefore, we occasionally resort to using automated bots to request
further testing. This is
** Changed in: linux (Ubuntu)
Status: Incomplete = Confirmed
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Title:
No backlight display Acer Aspire 5734Z
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As per the automated request for further testing, I have downloaded the
latest Oneiric Ocelot daily build (20110912) which uses a newer
development kernel. The bug is still present. I have also noticed that
while the proposed fix (see comment #9 above) does restore backlighting,
but not after
This bug also affects Fedora Core 15.
** Also affects: linux (Fedora)
Importance: Undecided
Status: New
** Changed in: linux (Fedora)
Status: New = Confirmed
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When writing to 0xF4, you're pretty much doing what the kernel from Kamal's ppa
is supposed to do.
What's the content of /sys/class/backlight (on both Natty and latest Oneiric)?
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This is the result from the latest Oneiric build.
ubuntu@ubuntu:~$ ls -hal /sys/class/backlight
total 0
drwxr-xr-x 2 root root 0 2011-09-13 22:35 .
drwxr-xr-x 49 root root 0 2011-09-13 22:35 ..
lrwxrwxrwx 1 root root 0 2011-09-13 22:36 acpi_video0 -
This is the output result from 11.04 Natty Narwhal
ubuntu@ubuntu:~$ ls -hal /sys/class/backlight
total 0
drwxr-xr-x 2 root root 0 2011-09-13 22:48 .
drwxr-xr-x 49 root root 0 2011-09-13 22:48 ..
lrwxrwxrwx 1 root root 0 2011-09-13 22:50 acpi_video0 -
../../devices/virtual/backlight/acpi_video0
On a related note, I attempted to run Oneiric with an /etc/X11/xorg.conf file
in place that referenced the i915 driver. I was greeted by the Try or Install
prompt with the backlight activated, but no wallpaper. When I attempted to Try
Ubuntu X crashed.
The system remained up and running with an
I would also like to point out that the output for Natty was taken from
the LiveCD. I currently do NOT have 11.04 installed due to this bug. I
have been running Oneiric from a 4GB flash drive with occasional
installs to a dedicated partition on my hard drive specifically for
testing purposes. My
Okay, let's stick with Oneiric. I assume that when the machine comes up
with no backlight, adjusting the brightness (by using Hotkeys or the
GUI) doesn't work either?
If that's correct, here's a couple of things you can test:
1. see what's in acpi_video/bl_power
2. when you try to adjust the
Thank you for taking the time to file a bug report on this issue.
However, given the number of bugs that the Kernel Team receives during
any development cycle it is impossible for us to review them all.
Therefore, we occasionally resort to using automated bots to request
further testing. This is
On my emachine e725 while in the bootloader itself I press the Fn +
keys. This is a brightness control that actually works Ubuntu boots
fine with the Kernel Version 2.6.38-11, Please refer to Bug #830907 for
more details from apport.
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A workaround has been found, and confirmed to work. After booting into
the OS, running this command in the terminal activates the back light.
$ sudo setpci -s 00:02.0 F4.B=0
Unfortunately this command must be run after every boot. When resuming
from suspend, the back light does not return.
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This also affects me on an Acer Aspire 5332. After the last Kernel
update it wiped 2.6.35-30 so I have to suffer. I have a workaround but
it's not ideal. Hope this gets fixed as I don't want to abandon Linux.
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Hey Chris (chrisdbrown16) would you care to explain your workaround? It
might help get this thing get tracked down and fixed.
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Title:
No
Also affected here with an Acer laptop using Intel Mobile Series 4
graphics. Given the difficulties of the workarounds on resume from
hibernate/sleep, I'm keeping the affected system on the 10.10 release
until this bug is fixed. If additional information is useful to the
developers, please ask
Sorry - to be clear, like Travis above I am seeing no backlight at all
after the plymouth splash screen when booting; it's not a brightness
control issue - it's just turned off completely.
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The problem needs to be fixed, I am scared that in the next release
11.10 the old kernel 2.6.35-30 will be wiped out I will no longer be
able to boot into Ubuntu. I know its free but to be a challenger is one
thing, Ubuntu can be the champion, with bugs like this I dont see a
future. I may have
** Changed in: linux (Ubuntu)
Status: New = Confirmed
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Title:
No backlight display Acer Aspire 5734Z
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** Summary changed:
- No display backlight
+ No backlight display Acer Aspire 5734Z
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This could be bug 568611. There's a ppa with experimental packages at
https://launchpad.net/~kamalmostafa/+archive/linux-kamal-mjgbacklight .
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Thanks julianw. I appreciate your comments but this is not the same
issue. The backlight is not powering on at all. However, I will test the
experimental package just to be sure.
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