[Bug 63931] [7 Series] [Backlight] Incorrectly driver set backlight

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=63931

--- Comment #10 from Bastien Nocera <bugzilla at hadess.net> ---
(In reply to comment #9)
> (In reply to comment #8)
> > (In reply to comment #4)
> > > It is not a bug in -intel or i915.ko, but in the acpi driver for your
> > > backlight.
> > 
> > Yes the backlight is controller by acpi video driver, but video driver works
> > correctly. The breaking part is xbacklight always return 100 while actual
> > brightness level is not. I wonder how report information to xbacklight?
> 
> I mean, who report information to xbacklight?

The driver, through the backlight property of XRandR. So if the backlight
reporting is broken in the driver's XRandR implementation, but works using the
kernel directly, the driver has a problem.

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