[Intel-gfx] Fixing i915/opregion issues with firmware which lists more then 8 output devices

[thermatk(EZN)]

Hello!
I have tried the patch https://patchwork.freedesktop.org/series/4783/ by
compiling manjaro kernel 4.6-rc4 with it, the brightness keys still don't
work on an Asus UX305FA.
FYI, applying the hacky https://bugzilla.kernel.org/attachment.cgi?id=195071
certainly makes them work.
If I can provide any further information that can be used to fix this, I'm
ready to help!
Sincerely,
Ruslan Boitsov
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