Happening for me too after recent updates. GPU hangs would happen up to multiple times per minute. Originally I was running precise and using the precise kernel/X11 stack. I reinstalled from 12.04.2 media with the quantal kernel/X11 stack, but after getting the latest updates it started happening again.
I've now installed the proposed 3.5.0-28 kernel and it seems to have fixed the problem.
Happening for me too after recent updates. GPU hangs would happen up to multiple times per minute. Originally I was running precise and using the precise kernel/X11 stack. I reinstalled from 12.04.2 media with the quantal kernel/X11 stack, but after getting the latest updates it started happening again.
I've now installed the proposed 3.5.0-28 kernel and it seems to have fixed the problem.