[Bug 115011] [drm:radeon_acpi_init [radeon]] *ERROR* Cannot find a backlight controller

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=115011

Alex Deucher <alexdeucher at gmail.com> changed:

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                 CC|                            |alexdeucher at gmail.com

--- Comment #10 from Alex Deucher <alexdeucher at gmail.com> ---
(In reply to Luya Tshimbalanga from comment #7)
> Created attachment 210281 [details]
> dmesg with 4.6.0-0.rc0.git13.1
> 
> dmesg report using latest git kernel i.e. 4.6.0-0. Same result:
> 
> [    7.498283] [drm:radeon_acpi_init [radeon]] *ERROR* Cannot find a
> backlight controller

This message is harmless.  Your laptop has two GPUs.  The ATIF ACPI method is
used to notify the driver of backlight change events so the driver checks to
see if it exists.  Depending on the board configuration, the secondary GPU may
or may not have access to the backlight controller.  In this case it does not.

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