Comment 277 for bug 541492

I confirm that graphics run a lot more stable now, however, the issue is not gone:

I had been working around the lockups by setting
  Option "DRI" "false"
  Option "Shadow" "true"
in my xorg.conf

Recently, I wondered if the problem still exists, and I removed these lines. The machines ran quite stable in day-to-day life, but I could still reproducibly crash the GPU running the demo of "celestia (Gnome)" (part of the edubuntu package).

The weird thing is that after approx. one week, crashes started to increase a lot, and I had to reenable the DRI/Shadow workaround. Note that these machines are LTSP clients, all graphics goes across the network.

I have the impression that GPU lockups occur when network traffic is high, i.e., X needs to wait for graphics data more often.

All in all, things have improved a lot, but the problem has not "magically disappeared". I don't believe it's fixed.