https://bugs.freedesktop.org/show_bug.cgi?id=43835
--- Comment #1 from Alex Deucher agd5f@yahoo.com 2011-12-14 09:19:34 PST --- In the future, please attach the dmesg and log files directly. It looks like it's a problem with acceleration (which is available without the firmware). I don't see any oops or backtraces in the logs. Can you attach the oops or get a picture of it?
Does setting: Option "NoAccel" "True" in the device section of your xorg.conf fix the problem?