| Summary: | backlight switches off when starting X - since kernel-3.13 | ||||||||||
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| Product: | DRI | Reporter: | nl | ||||||||
| Component: | DRM/Radeon | Assignee: | Default DRI bug account <dri-devel> | ||||||||
| Status: | RESOLVED FIXED | QA Contact: | |||||||||
| Severity: | blocker | ||||||||||
| Priority: | high | CC: | cyaniris, gary.c.wang | ||||||||
| Version: | XOrg git | ||||||||||
| Hardware: | Other | ||||||||||
| OS: | All | ||||||||||
| Whiteboard: | |||||||||||
| i915 platform: | i915 features: | ||||||||||
| Attachments: |
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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) 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 :( Does disabling runpm help? Boot with radeon.runpm=0 on the kernel command line in grub. (In reply to comment #3) > Does disabling runpm help? Boot with radeon.runpm=0 on the kernel command > line in grub. yes it does :) thank you Please attach your dmesg output. Is this a muxed or muxless laptop? Created attachment 99349 [details] [review] possible fix Does the attached patch help? Created attachment 99424 [details]
dmesg output before patching (and with runpm)
(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. Created attachment 99427 [details] [review] possible fix v2 (In reply to comment #9) > 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. Does this patch work any better? (In reply to comment #10) > Created attachment 99427 [details] [review] [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) 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". Forgot to say : this is a muxed laptop. Fix is upstream: http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=f2bc561610962693be61425cf913778586d8f9c1 and will make it's way back to stable kernels as well. 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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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.