Comment # 2 on bug 56666 from runetmember@gmail.com

> This might be a duplicate of bug 56405. 
Probably. If my issue is still reproducible when the bug 56405 will be fixed,
I'll reopen this bugreport.

> Can you try mesa 8.0.x?
With Mesa 8.0.2 (Kubuntu 12.04.1 x86_64 LiveCD) there is no GPU lockup in
Unigine Heaven 3.

> If 8.0.x works, can you bisect?
I'm afraid I can't.