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[David Mitchell <launchpad.admin@xxxxxxxxxxxxxx>]

Also seem to have same issue - Intel Atom 330 dual core with 945
chipset. identical messages in syslog

uname -a is
Linux Mythbox-1 2.6.31-16-generic #53-Ubuntu SMP Tue Dec 8 04:02:15 UTC 2009 x86_64 GNU/Linux

syslog has 
Dec 26 21:13:06 Mythbox-1 kernel: [ 6001.203871] Call Trace:
Dec 26 21:13:06 Mythbox-1 kernel: [ 6001.203891]  [<ffffffff815286a7>] __mutex_lock_slowpath+0xd7/0x160
Dec 26 21:13:06 Mythbox-1 kernel: [ 6001.203901]  [<ffffffff815285a6>] mutex_lock+0x26/0x50
Dec 26 21:13:06 Mythbox-1 kernel: [ 6001.203955]  [<ffffffffa00618d8>] i915_gem_retire_work_handler+0x38/0x90 [i915]
Dec 26 21:13:06 Mythbox-1 kernel: [ 6001.203984]  [<ffffffffa00618a0>] ? i915_gem_retire_work_handler+0x0/0x90 [i915]
Dec 26 21:13:06 Mythbox-1 kernel: [ 6001.203996]  [<ffffffff810737a5>] run_workqueue+0x95/0x170
Dec 26 21:13:06 Mythbox-1 kernel: [ 6001.204006]  [<ffffffff81073924>] worker_thread+0xa4/0x120
Dec 26 21:13:06 Mythbox-1 kernel: [ 6001.204015]  [<ffffffff81078b30>] ? autoremove_wake_function+0x0/0x40
Dec 26 21:13:06 Mythbox-1 kernel: [ 6001.204024]  [<ffffffff81073880>] ? worker_thread+0x0/0x120
Dec 26 21:13:06 Mythbox-1 kernel: [ 6001.204033]  [<ffffffff81078746>] kthread+0xa6/0xb0
Dec 26 21:13:06 Mythbox-1 kernel: [ 6001.204042]  [<ffffffff810130ea>] child_rip+0xa/0x20
Dec 26 21:13:06 Mythbox-1 kernel: [ 6001.204051]  [<ffffffff810786a0>] ? kthread+0x0/0xb0
Dec 26 21:13:06 Mythbox-1 kernel: [ 6001.204058]  [<ffffffff810130e0>] ? child_rip+0x0/0x20
Dec 26 21:15:06 Mythbox-1 kernel: [ 6121.202005] INFO: task i915/0:267 blocked for more than 120 seconds.

repeated.

Interestingly this machine sometimes hangs on startup at the point where
it would switch into the X server, I was assume it had all hung but
looking in syslog it seems to be just the screen as other startup
processes are still running (at least until I pull the plug to restart
it!)

David

-- 
[i945G] karmic: INFO: task i915/* blocked for more than 120 seconds.
https://bugs.launchpad.net/bugs/451518
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