Comment 40 for bug 114520

General question to all of you:
Does the machine hang completely, or are just the screen and keyboard locked up? Can you try to ssh in from another machine, before starting X with dri enabled? You might try running "sudo cat proc/kmsg" in the ssh session to see if any error messages appear before/while the machine hangs/crashes. You can also (before starting X) unload the radeon and drm kernel modules, and reload the drm module with "modprobe drm debug=1" which should give a lot more debug messages.