[3.3-rc1]radeon 0000:07:00.0: GPU lockup CP stall for more than 10000msec

[Torsten Kaiser]

After updating to kernel 3.3-rc1 I have experienced a lockup of my GPU.
I left my KDE desktop running until the screensaver turned off the
monitors. But on key presses it would not turn back on. Ctrl+Alt+F1 to
switch to another virtual console also did not work.
Alt+SysRq magic still worked, so I was able to force the syslog to
disk and restart the system.