[Bug 61115] [regression] using vgaswitcheroo intel i915 goes to black.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=61115

--- Comment #8 from tjbp <freedesktop.org at tjbp.net> ---
(In reply to comment #7)
> Created attachment 78083 [details] [review]
> Don't clamp backlight when disabling on gen4+
> 
> Can everyone affected by this bug please test the attached patch? It
> hopefully fixes the backlight issues without causing problems on other
> systems - since on most systems we really want to disable the backlight.

I'm experiencing what may be the same issue with a MacBook Pro 9,1 - however I
have a truly black screen (a torch highlights nothing), and there is never any
"i915: switched on" line in dmesg. Should I try the patch or open a new bug
report?

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