https://bugs.freedesktop.org/show_bug.cgi?id=75917
Priority: medium Bug ID: 75917 Assignee: dri-devel@lists.freedesktop.org Summary: backlight switches of when starting X since kernel-3.13 Severity: normal Classification: Unclassified OS: All Reporter: nl@gnuffy.net Hardware: Other Status: NEW Version: XOrg CVS Component: DRM/Radeon Product: DRI
After updating from linux 3.12.8 to 3.13 my display backlight switches off when starting X. The kernel doesn't crash, it just switched off the backlight.
Hardware name: Acer Aspire 3820T/JM31_CP, BIOS V1.19 10/27/2010
This is a notebook with an intel/radeon hybrid graphics. I use intel for my X. I report this as radeon problem because git bisect (on linux-stable tree) showed the following commit as the cause of my problem:
10ebc0bc09344ab6310309169efc73dfe6c23d72 is the first bad commit commit 10ebc0bc09344ab6310309169efc73dfe6c23d72 Author: Dave Airlie <airlied at redhat.com> Date: Mon Sep 17 14:40:31 2012 +1000
drm/radeon: add runtime PM support (v2)
This hooks radeon up to the runtime PM system to enable dynamic power management for secondary GPUs in switchable and powerxpress laptops.
v2: agd5f: clean up, add module parameter
Signed-off-by: Dave Airlie <airlied at redhat.com> Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
Please let me know if you need addititonal information.
https://bugs.freedesktop.org/show_bug.cgi?id=75917
--- Comment #1 from Yuanjie cyaniris@gmail.com --- I have the same problem with radeon/intel laptop:
00:02.0 VGA compatible controller: Intel Corporation Core Processor Integrated Graphics Controller (rev 18) 02:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Madison [Mobility Radeon HD 5650/5750 / 6530M/6550M] (rev ff)
https://bugs.freedesktop.org/show_bug.cgi?id=75917
nl@gnuffy.net changed:
What |Removed |Added ---------------------------------------------------------------------------- Severity|normal |blocker Priority|medium |high
--- Comment #2 from nl@gnuffy.net --- As the problem still exists and prevents me from using any kernel 3.13+ I changed the priority of this bug.
When I did the git bisect I hoped it would help to find a solution soon.
Is there anything I can do to help fixing this problem?
I don't want to get stuck on kernel 3.12.20 :(
https://bugs.freedesktop.org/show_bug.cgi?id=75917
nl@gnuffy.net changed:
What |Removed |Added ---------------------------------------------------------------------------- Summary|backlight switches of when |backlight switches off when |starting X since |starting X - since |kernel-3.13 |kernel-3.13
https://bugs.freedesktop.org/show_bug.cgi?id=75917
--- Comment #3 from Alex Deucher agd5f@yahoo.com --- Does disabling runpm help? Boot with radeon.runpm=0 on the kernel command line in grub.
https://bugs.freedesktop.org/show_bug.cgi?id=75917
--- Comment #4 from nl@gnuffy.net --- (In reply to comment #3)
Does disabling runpm help? Boot with radeon.runpm=0 on the kernel command line in grub.
yes it does :)
https://bugs.freedesktop.org/show_bug.cgi?id=75917
--- Comment #5 from nl@gnuffy.net --- thank you
https://bugs.freedesktop.org/show_bug.cgi?id=75917
--- Comment #6 from Alex Deucher agd5f@yahoo.com --- Please attach your dmesg output. Is this a muxed or muxless laptop?
https://bugs.freedesktop.org/show_bug.cgi?id=75917
--- Comment #7 from Alex Deucher agd5f@yahoo.com --- Created attachment 99349 --> https://bugs.freedesktop.org/attachment.cgi?id=99349&action=edit possible fix
Does the attached patch help?
https://bugs.freedesktop.org/show_bug.cgi?id=75917
--- Comment #8 from nl@gnuffy.net --- Created attachment 99424 --> https://bugs.freedesktop.org/attachment.cgi?id=99424&action=edit dmesg output before patching (and with runpm)
https://bugs.freedesktop.org/show_bug.cgi?id=75917
--- Comment #9 from nl@gnuffy.net --- (In reply to comment #7)
Does the attached patch help?
The patch works fine, however the display backlight switches off for several seconds during X init now (it didn't with kernel 2.12) but this is not really a problem, as it comes back happily :) thank you.
https://bugs.freedesktop.org/show_bug.cgi?id=75917
--- Comment #10 from Alex Deucher agd5f@yahoo.com --- Created attachment 99427 --> https://bugs.freedesktop.org/attachment.cgi?id=99427&action=edit possible fix v2
(In reply to comment #9)
Does this patch work any better?
https://bugs.freedesktop.org/show_bug.cgi?id=75917
--- Comment #11 from nl@gnuffy.net --- (In reply to comment #10)
Created attachment 99427 [details] [review] possible fix v2
Does this patch work any better?
No, pretty much the same behaviour as the first version here. The backlight switches off when X starts, and comes backs ~5 seconds later. (same delay in restoring backlight after resume from suspend)
https://bugs.freedesktop.org/show_bug.cgi?id=75917
--- Comment #12 from sfievet sebastien.fievet@free.fr --- I am affected by this bug too. I have a Acer 3820TG laptop featuring Intel IGP (Ironlake) / AMD DGP (Radeon 6550M). It kept me stucked with kernel 3.12 series until I googled for "backlight issue" rather than "Intel driver issue" and found THIS bug report. :-)
adding radeon.runpm=0 to the boot options works for me too. I haven't tested the patch yet.
FWIW, I'd like to add 2 side informations hoping it might be related : - the backlight control only works for the Intel IGP. If the laptop goes idle when on the radeon, waking it up doesn't bring the backlight back. - when switching from Ironlake to Radeon through VGA switcheroo, I have to use "ON -> MIGD -> DDIS" sequence as the screen goes black immediately after passing "ON".
https://bugs.freedesktop.org/show_bug.cgi?id=75917
--- Comment #13 from sfievet sebastien.fievet@free.fr --- Forgot to say : this is a muxed laptop.
https://bugs.freedesktop.org/show_bug.cgi?id=75917
--- Comment #14 from Alex Deucher agd5f@yahoo.com --- Fix is upstream: http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=f2... and will make it's way back to stable kernels as well.
https://bugs.freedesktop.org/show_bug.cgi?id=75917
Alex Deucher agd5f@yahoo.com changed:
What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED Resolution|--- |FIXED
https://bugs.freedesktop.org/show_bug.cgi?id=75917
--- Comment #15 from sfievet sebastien.fievet@free.fr --- I just applied the fixed against 3.15.0, and it does work as reported. The 5s delay at X startup is a bit annoying but acceptable... In my case it actually happens twice : - at X startup - at session start (presumably when the XFCE power manager tool starts up)
Thank you for helping us out
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