MacBook Pro 10,1 + i915

[Marek Vasut]

Hi guys,

I recently got the rMBP 10,1 model, it has two graphic cards:

00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor 
Graphics Controller (rev 09)
01:00.0 VGA compatible controller: NVIDIA Corporation GK107M [GeForce GT 650M 
Mac Edition] (rev a1)

I'm running linux 3.10-rc7 . The nvidia works with nouveau, but I'd prefer to 
switch the nvidia off altogether and use the intel GPU.

So far I arrived at the point where I disabled X11, mounted debugfs and tried 
the vgaswitcheroo. With the nvidia still in operation, I see the console. 
Unfortunatelly, I end up with a black screen after I run the following command 
to switch to the intel GPU:

echo IGD > /sys/kernel/debug/vgaswitcheroo/switch

If I try to switch back to the nvidia card (using echo DIS > ...), the screen 
remains black. This state persists until reboot. I suspect [1] is the same bug, 
none of the hints there helped.

Can you please give me any hint/patch/idea/... how to continue?

Thank you!

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

Best regards,
Marek Vasut