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.

-- 
You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xserver-xorg-video-intel in Ubuntu.
https://bugs.launchpad.net/bugs/541492

Title:
  MASTER: [i845] GPU lockup

To manage notifications about this bug go to:
https://bugs.launchpad.net/xserver-xorg-video-intel/+bug/541492/+subscriptions

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