Also, the bug I saw when testing patches with kernel 3.12-rc1 just happened
with 3.11.0. The screen turns white and everything is frozen. I can't connect
through ssh (without the patches, when the screen hanged, I was able to connect
through ssh).

I can't find anything in logs that could help identify what is going on. I
wasn't doing anything special and I can start a game under Steam where the
GPU's fan will accelerate (which is a sign the card is now running faster)
without any problem. The computer can just sit there while nothing happens and
freezes (with a white screen).

I'm tempted to open a different bug, what do you think Alex?