[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 #12 from Miguel Negrão <miguel.negrao at friendlyvirus.org> ---
I have a macbookpro8,2 and I'm in the exact same situation as reported above.
Switchting from DIS to IGD causes the screen to go completely black (nothing is
seen even with a torch), going back (blindly) from IGD to DIS brings the screen
back. 

I'm booting using EFI stub via rEFInd. It makes no difference if I add the
flags "i915.lvds_channel_mode=2 i915.modeset=1 i915.lvds_use_ssc=0".

I think this bug is already reported in the kernel bug tracker: 
https://bugzilla.kernel.org/show_bug.cgi?id=56911

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