[Bug 72959] [Backlight] Very slow response changing backlight on intel video

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=72959

Chris Wilson <chris at chris-wilson.co.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |NOTOURBUG

--- Comment #2 from Chris Wilson <chris at chris-wilson.co.uk> ---
It's yet another bug in the ACPI firmware. It has been decided that for Windows
8 machines that the ACPI layer is so typically buggy that the kernel will not
expose the advertised ACPI backlight routines. But prior to that using the ACPI
layer was the only universal way to control the backlight. (I have a few
machines on which the backlight is not controlled by Intel's PWM.) Suffice to
say, all I can other is the workaround, the root cause is elsewhere.

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