Did any of you ever solve this? I have the same exact issue.
It seems to happen most (maybe always) when playing a flash video.
In system log I get this error:
[0x0-0x25025].com.google.Chrome[253]: [278:15111:0328/010722:ERROR:gpu_watchdog_thread.cc(253)] The GPU process hung. Terminating after 10000 ms.
also I get a bunch of "deny file-write" errors:
[293]): DumpGPURestart(293) deny file-write-create /Library/Application Support/SubmitDiagInfo
At the same time in kernel log I get a bunch of these errors:
NVDA(OpenGL): Channel exception! exception type = 0x6 = Fifo: Parse Error
and the occassional:
NVDA(OpenGL): Channel timeout!
When my computer "freezes" and I'm watching a video, the sound will continue to play as if nothings wrong, but the mouse and keyboard are frozen. After a while, the screen will shut off, and I can use the mouse or keyboard to get the screen to come back on, but the mouse and keyboard are still frozen! Very strange.
Other symptoms I see are occasional white "flickering" of the screen. This seems to be the GPU "restarting".
I have a Mac Pro 3,1 SMBIOS. OSX 10.7.3
E7200 Core 2 Duo CPU
ASROCK P43Twins1600 motherboard
Nvidia 9800 GTX Video Card