[Bug 75917] New: backlight switches of when starting X since kernel-3.13

[Bug 75917] New: backlight switches of when starting X since kernel-3.13

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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.

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[Bug 75917] backlight switches of when starting X since kernel-3.13

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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)

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[Bug 75917] backlight switches of when starting X since kernel-3.13

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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 :(

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[Bug 75917] backlight switches off when starting X - since kernel-3.13

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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

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[Bug 75917] backlight switches off when starting X - since kernel-3.13

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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.

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[Bug 75917] backlight switches off when starting X - since kernel-3.13

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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 :)

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[Bug 75917] backlight switches off when starting X - since kernel-3.13

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https://bugs.freedesktop.org/show_bug.cgi?id=75917

--- Comment #5 from nl@gnuffy.net ---
thank you

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[Bug 75917] backlight switches off when starting X - since kernel-3.13

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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?

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[Bug 75917] backlight switches off when starting X - since kernel-3.13

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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?

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[Bug 75917] backlight switches off when starting X - since kernel-3.13

[bugzilla-daemon]

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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)

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[Bug 75917] backlight switches off when starting X - since kernel-3.13

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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.

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[Bug 75917] backlight switches off when starting X - since kernel-3.13

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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)
> 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?

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[Bug 75917] backlight switches off when starting X - since kernel-3.13

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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)

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[Bug 75917] backlight switches off when starting X - since kernel-3.13

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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".

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[Bug 75917] backlight switches off when starting X - since kernel-3.13

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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.

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[Bug 75917] backlight switches off when starting X - since kernel-3.13

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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=f2bc561610962693be61425cf913778586d8f9c1
and will make it's way back to stable kernels as well.

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[Bug 75917] backlight switches off when starting X - since kernel-3.13

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https://bugs.freedesktop.org/show_bug.cgi?id=75917

Alex Deucher <agd5f@yahoo.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

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[Bug 75917] backlight switches off when starting X - since kernel-3.13

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--- 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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