[Bug 68151] New: Backlight brightness change causes freeze (radeon with KMS)

[Bug 68151] New: Backlight brightness change causes freeze (radeon with KMS)

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=68151

            Bug ID: 68151
           Summary: Backlight brightness change causes freeze (radeon with
                    KMS)
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.13-rc6
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: high
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: fabian@ritter-vogt.de
        Regression: No

Created attachment 120871
  --> https://bugzilla.kernel.org/attachment.cgi?id=120871&action=edit
Output of hwinfo

If I change the backlight brightness using the brightness keys on my keyboard,
sometimes the system freezes. SysRq doesn't work. Mobility radeon 5470 with KMS
enabled. I first noticed this when upgrading openSUSE from 12.3 (3.7.10) to
13.1 (3.11.6). I have to use "acpi_backlight=vendor" to disable acpi_video0,
which isn't working and has a higher priority than radeon_bl0.

Reproducible: Always

The hwinfo was created with the older, working kernel running.

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[Bug 68151] Backlight brightness change causes freeze (radeon with KMS)

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=68151

--- Comment #1 from Michel Dänzer <michel@daenzer.net> ---
Can you bisect?

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[Bug 68151] Backlight brightness change causes freeze (radeon with KMS)

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=68151

Alan <alan@lxorguk.ukuu.org.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |alan@lxorguk.ukuu.org.uk
         Regression|No                          |Yes

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[Bug 68151] Backlight brightness change causes freeze (radeon with KMS)

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=68151

--- Comment #2 from Fabian <fabian@ritter-vogt.de> ---
I'll try it but it'll take a while..

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[Bug 68151] Backlight brightness change causes freeze (radeon with KMS)

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=68151

Fabian <fabian@ritter-vogt.de> changed:

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

--- Comment #3 from Fabian <fabian@ritter-vogt.de> ---
I tried to bisect it but somehow it got very hard to reproduce at some point.
I had to change the backlight for almost a minute before it freezes and with
the new 3.15.0-rc4 I'm running on I can't reproduce it with normal usage.
I can't tell for sure whether it's fixed, but it works definitely reliable
enough for me, so closing as "unreproducible" for now.

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