https://bugs.freedesktop.org/show_bug.cgi?id=45018
--- Comment #28 from Harald Judt h.judt@gmx.at 2012-02-25 16:03:32 PST --- Ok. Now with latest git, there is an improvement: No kernel crash anymore, but compiz still hangs when rotating the cube and the X screen freezes. Gladly, I can switch VT and pkill -9 and restart compiz, and X is usable again. At least no need to reboot!
The following line appeared in dmesg when the freeze happened: radeon 0000:01:00.0: offset 0x300000 is in reserved area 0x800000