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[Robin Becker <robin@xxxxxxxxxxxxx>]

I have exactly the same problem with a Dell Dimension 2400 system with
intel graphics. The keyboard + screen are locked. I can however ssh into
the system and then in dmesg output I am seeing this

[70080.736033] INFO: task i915/0:234 blocked for more than 120 seconds.
[70080.736041] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[70080.736046] i915/0        D c08145c0     0   234      2 0x00000000
[70080.736057]  d74a9f04 00000046 d79f194c c08145c0 d79f1bb8 c08145c0 c357bbf6 00003f8d
[70080.736070]  c08145c0 c08145c0 d79f1bb8 c08145c0 c357b4b4 00003f8d c08145c0 de1d7a00
[70080.736083]  d79f1920 de297c14 de297c18 ffffffff d74a9f30 c056f776 c0748e80 de297c1c
[70080.736096] Call Trace:
[70080.736115]  [<c056f776>] __mutex_lock_slowpath+0xc6/0x130
[70080.736122]  [<c056f690>] mutex_lock+0x20/0x40
[70080.736169]  [<e084ec0a>] i915_gem_retire_work_handler+0x2a/0x70 [i915]
[70080.736182]  [<c0157a7e>] run_workqueue+0x6e/0x140
[70080.736201]  [<e084ebe0>] ? i915_gem_retire_work_handler+0x0/0x70 [i915]
[70080.736209]  [<c0157bd8>] worker_thread+0x88/0xe0
[70080.736217]  [<c015c280>] ? autoremove_wake_function+0x0/0x40
[70080.736224]  [<c0157b50>] ? worker_thread+0x0/0xe0
[70080.736230]  [<c015bf8c>] kthread+0x7c/0x90
[70080.736237]  [<c015bf10>] ? kthread+0x0/0x90
[70080.736245]  [<c0104007>] kernel_thread_helper+0x7/0x10


I suspect this must be the root cause of the problem.

-- 
[i915gm] [jaunty,karmic] X freezes every day or so
https://bugs.launchpad.net/bugs/438346
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