[Bug 73252] [Baytrail-M] brightness can't be adjusted: no ASLE interrupt code

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=73252

--- Comment #8 from Daniel Vetter <daniel at ffwll.ch> ---
Afaik we need this at least on some machines since the ACPI backlight uses
OpRegion request to adjust the real hw backlight. So the flow on these machines
is:

1. button press
2. ACPI button converted to input key event
3. Userspace calculates new backlight and frobs the ACPI backlight
4. ACPI stores request value in OpRegion and generates the special OpRegeion
interrupt.
5. drm/i915 updates the backlight.
6. User is happy

Do not ask, won't tell.

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