I use the ppa xorg-edgers to provide the latest mesa developpment on my
computer: Ubuntu 12.10 64 bits because the version present in the software
center is too old to run "recent" games and the fglrx-legacy doesn't work: my
graphic card is (return of command lspci | grep VGA): 01:05.0 VGA compatible
controller: Advanced Micro Devices [AMD] nee ATI RS880M [Mobility Radeon HD
4200 Series

Since some weeks I try to play at Urban Terror but here it doesn't work
properly: after few 10 minutes, the screen freezes and I got the following
message loop in a terminal (Ctrl+Alt+F1): "radeon 0000:01:05.0: GPU lockup CP
stall for more than 1000msec" and that's all, I must reboot my computer (main
screen freezes). I precise it's the only game that produce this bug...