[Bug 48941] New: Error creating '/sys/class/backlight/radeon_bl' in radeon_atom_backlight_init()

[Bug 48941] New: Error creating '/sys/class/backlight/radeon_bl' in radeon_atom_backlight_init()

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=48941

           Summary: Error creating '/sys/class/backlight/radeon_bl' in
                    radeon_atom_backlight_init()
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.7.0-rc1
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
        AssignedTo: drivers_video-dri@kernel-bugs.osdl.org
        ReportedBy: e-mail@date.by
        Regression: No


Created an attachment (id=83691)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=83691)
dmesg

There is an error in my dmesg:

sysfs: cannot create duplicate filename '/class/backlight/radeon_bl'

and there is no '/sys/class/backlight/radeon_bl' after system boot.

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[Bug 48941] Error creating '/sys/class/backlight/radeon_bl' in radeon_atom_backlight_init()

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=48941





--- Comment #1 from Igor Murzov <e-mail@date.by>  2012-10-17 00:35:56 ---
Created an attachment (id=83701)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=83701)
lspci -vvv

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[Bug 48941] Error creating '/sys/class/backlight/radeon_bl' in radeon_atom_backlight_init()

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=48941


Alex Deucher <alexdeucher@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |alexdeucher@gmail.com




--- Comment #2 from Alex Deucher <alexdeucher@gmail.com>  2012-10-17 14:01:08 ---
You have a hybrid laptop with with a mux to switch between the two GPUs.  I
suppose ideally we'd only create one bl device and switch control of it when
the mux is switched.  I'm not sure of the best way to do that off hand at the
moment.

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[Bug 48941] Error creating '/sys/class/backlight/radeon_bl' in radeon_atom_backlight_init()

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=48941





--- Comment #3 from Igor Murzov <e-mail@date.by>  2012-10-17 16:44:02 ---
Can I help somehow with this and other issue with hybrid systems with a mux?
Looks like not much people have such configuration and linux becomes more and
more buggy with regard to gpus on my laptop. I can help testing patches or may
be bisect some regression for you or even inspect some code :]

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[Bug 48941] Error creating '/sys/class/backlight/radeon_bl' in radeon_atom_backlight_init()

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=48941





--- Comment #4 from Alex Deucher <alexdeucher@gmail.com>  2012-10-17 20:05:42 ---
The acpi backlight control should still work.

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[Bug 48941] Error creating '/sys/class/backlight/radeon_bl' in radeon_atom_backlight_init()

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=48941





--- Comment #5 from Alex Deucher <alexdeucher@gmail.com>  2012-10-17 21:24:04 ---
Created an attachment (id=83751)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=83751)
give each radeon_bl a unique name

This patch should fix the issue, however, you'll have to use the appropriate bl
device depending on which gpu is active.

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[Bug 48941] Error creating '/sys/class/backlight/radeon_bl' in radeon_atom_backlight_init()

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=48941





--- Comment #6 from Igor Murzov <e-mail@date.by>  2012-10-19 15:16:21 ---
The patch fixed the issue. I have two bl devices now:
# tree /sys/class/backlight/
/sys/class/backlight/
├── radeon_bl0 ->
../../devices/pci0000:00/0000:00:01.0/0000:01:05.0/drm/card0/card0-LVDS-1/radeon_bl0
└── radeon_bl1 ->
../../devices/pci0000:00/0000:00:02.0/0000:02:00.0/drm/card1/card1-LVDS-2/radeon_bl1

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[Bug 48941] Error creating '/sys/class/backlight/radeon_bl' in radeon_atom_backlight_init()

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=48941


Florian Mickler <florian@mickler.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |florian@mickler.org




--- Comment #7 from Florian Mickler <florian@mickler.org>  2012-11-05 23:15:22 ---
A patch referencing this bug report has been merged in Linux v3.7-rc3:

commit 614499b4d844dcceae5ae2f1e53a2963789a8933
Author: Alex Deucher <alexander.deucher@amd.com>
Date:   Wed Oct 17 17:20:24 2012 -0400

    drm/radeon: give each backlight a unique id

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[Bug 48941] Error creating '/sys/class/backlight/radeon_bl' in radeon_atom_backlight_init()

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=48941


Igor Murzov <e-mail@date.by> changed:

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




--- Comment #8 from Igor Murzov <e-mail@date.by>  2012-11-05 23:36:42 ---
Fixed.

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