[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

Hans de Goede <jwrdegoede at fedoraproject.org> changed:

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--- Comment #12 from Hans de Goede <jwrdegoede at fedoraproject.org> ---
Hi Alex,

(In reply to Alex Deucher from comment #10)
> (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.

Mayebe we need to make the error a bit less scary then, e.g. :

 [drm:radeon_acpi_init [radeon]] *Warning* Cannot find a backlight controller,
this is ussualy harmless on dual gpu systems

Yes it is a bit long, but it will likely help to avoid future bug reports about
this.

Regards,

Hans

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