[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

--- Comment #11 from Luya Tshimbalanga <luya at fedoraproject.org> ---
(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.

Thank you for explaining the meaning of the message related to dual GPUs. It
will be nice to improve the mechanism where one of GPU cannot access to the
backlight controller.

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