Upstream developer Daniel Vetter has developed a more sophisticated
backlight patch set which fixes this problem for the Dell XPS 13z. I
have updated my DellXPS kernel PPA to include this new patch set since
it will likely appear in the mainline kernel soon (the new "kamal1"
version of the PPA ker
The ppa-kernel actually helped me on a Panasonic CF-18 which had the
same problem under Precise. There were two interfaces under
/sys/class/brightness: intel_backlight and panasonic. I think the
XF86BrightnessUp only tried to adjust the intel_backlight, which did
nothing.
Writing directly to panas
** Also affects: linux (Ubuntu Precise)
Importance: Undecided
Status: New
** Also affects: xserver-xorg-video-intel (Ubuntu Precise)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Quantal)
Importance: Medium
Assignee: Kamal Mostafa (kamalmostafa)
** Patch added:
"0002-drm-i915-quirk-disable-i915-backlight-on-Dell-XPS-13.patch"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/954661/+attachment/3103723/+files/0002-drm-i915-quirk-disable-i915-backlight-on-Dell-XPS-13.patch
** Patch removed:
"0001-i915-i915.enable_backlight-0-disabl
Patches submitted to intel-gfx.
** Patch added:
"0001-drm-i915-i915.enable_backlight-0-disables-intel_back.patch"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/954661/+attachment/3103721/+files/0001-drm-i915-i915.enable_backlight-0-disables-intel_back.patch
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The "i915-enable-backlight" kernel PPA has been moved to:
https://launchpad.net/~kamalmostafa/+archive/dellxps and includes
additional fixes relevant to Dell XPS 13z and XPS 15z.
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Kamal,
I can confirm this works for me too, thanks.
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Title:
backlight brightness not adjustable by default on Dell XPS 13
To manage notification
Robert Hooker has provided an additional patch which automatically
switches off the i915.enable_backlight parameter (see comment #18) for
the Dell XPS13.
The PPA kernel now includes both patches (as of the ~kamal1 version):
https://launchpad.net/~kamalmostafa/+archive/i915-enable-backlight
With t
** Patch added:
"0001-i915-i915.enable_backlight-0-disables-intel_backligh.patch"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/954661/+attachment/3079343/+files/0001-i915-i915.enable_backlight-0-disables-intel_backligh.patch
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** Patch added: "0002-i915-quirk-disable-i915-backlight-on-Dell-XPS13.patch"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/954661/+attachment/3079362/+files/0002-i915-quirk-disable-i915-backlight-on-Dell-XPS13.patch
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The attachment "i915-enable-backlight.patch" of this bug report has been
identified as being a patch. The ubuntu-reviewers team has been
subscribed to the bug report so that they can review the patch. In the
event that this is in fact not a patch you can resolve this situation by
removing the tag
I've written a patch which provides a new kernel boot param
"i915.enable_backlight=0".
i915.enable_backlight=0 can be used to disable i915 backlight control
and the /sys/class/backlight/intel_backlight interface -- useful for
systems where intel_backight conflicts with BIOS backlight c
I have a Dell XPS13 in hand now and can easily reproduce the problem; I
am working on an improved work-around.
** Changed in: linux (Ubuntu)
Status: Triaged => In Progress
** Changed in: linux (Ubuntu)
Assignee: (unassigned) => Kamal Mostafa (kamalmostafa)
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Robert,
Yes, that is correct. Matter of fact for now on this machine I've created
an upstart job and pm resume script to do just that on boot so that
brightness control is functional until intel_backlight can be sorted out
properly.
On Tue, Apr 10, 2012 at 17:40, Robert Hooker wrote:
> http://
http://permalink.gmane.org/gmane.linux.gentoo.user/255182 seems to imply
an echo 0 > /sys/class/backlight/intel_backlight/brightness fixes the
acpi_video0 interface
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Kamal:
With those boot options I only have intel_backlight in
/sys/class/backlight. The brightness keys do move up and down the
values, but the screen brightness pulsates rather than flickers.
** Attachment added: "upside down video showing pulsating"
https://bugs.launchpad.net/ubuntu/+sourc
Mario, how about trying with "acpi_backlight=vendor" and also
"dell_laptop.backlight=0" (goal still being to leave only
intel_backlight).
Please report what you end up with in /sys/class/backlight in that case,
and then whether you still see the flicker when you adjust the
intel_backlight/brightne
Kamal,
I booted with acpi_backlight=vendor, and that makes things worse out of the
box. At max brightness (what it boots by default) no discernable
difference. Then when the screen goes into idle after a few minutes not on
AC it starts flickering at me violently. The same thing happens if I
man
Mario, from your comment #5, it sounds to me like the problem may be due
to there being two /sys/class/backlight interfaces present (acpi_video0
and intel_backlight). Mario & Daniel, you might try booting with the
kernel boot parameter "acpi_backlight=vendor" which should disable
acpi_video0 leav
This issue appears to be an upstream bug, since you tested the latest
upstream kernel. Would it be possible for you to open an upstream bug
report at bugzilla.kernel.org [1]? That will allow the upstream
Developers to examine the issue, and may provide a quicker resolution to
the bug.
If you are
Yes, the problem persists with the upstream kernel listed there:
(Linux test-Dell-System-XPS-L321X 3.4.0-030400rc1-generic #201203312035 SMP Sun
Apr 1 00:36:22 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux)
** Tags removed: needs-upstream-testing
** Tags added: kernel-bug-exists-upstream
** Changed in
Would it be possible for you to test the latest upstream kernel? Refer
to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest
v3.4kernel[1] (Not a kernel in the daily directory). Once you've tested
the upstream kernel, please remove the 'needs-upstream-testing' tag(Only
that one
Actually I have tested it with 3.2.0.22-generic #35. Persists with that
kernel too.
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
** Tags added: bot-stop-nagging
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** Also affects: xserver-xorg-video-intel (Ubuntu)
Importance: Undecided
Status: New
** Changed in: xserver-xorg-video-intel (Ubuntu)
Status: New => Invalid
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** Changed in: linux (Ubuntu)
Status: New => Confirmed
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Title:
backlight brightness not adjustable by default on Dell XPS 13
To manage not
At least to me this doesn't look like it's at all caused by a userspace
interpretation problem, it's caused only by this intel_backlight
interface. It's defaulting to the maximum value it can be set to
(4882).
* The button presses do actually translate into the values of
/sys/class/backlight/acpi
Thank you. I wasn't entirely sure what package to report the bug
against.
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Title:
backlight brightness not adjustable by default on Dell XPS 13
T
Xorg has not managed the power settings for quite some time.
Since the kernel interface apparently works, it doesn't sound like a drm driver
bug.
The kernel doesn't persist its settings, that's gnome's job.
Bumping bug to the g-p-m queue.
** Package changed: xserver-xorg-video-intel (Ubuntu) =>
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Title:
backlight brightness not adjustable by default on Dell XPS 13
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubu
Oops, the command I mention above should be:
/bin/echo 0 > /sys/class/backlight/intel_backlight/brightness
Sorry for the typo.
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Title:
backli
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