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

[bugzilla-daemon at freedesktop.org]

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

--- Comment #8 from Aaron Lu <aaron.lu at intel.com> ---
(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?

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