Comment 11 for bug 485108

My e-machine desktop frequently freezes while the screen is asleep. Since I upgraded to Karmic this has been a real problem. Only way to get the system back is to hard boot. I get lots of these before things lock up:

Dec 9 18:00:46 localhost kernel: [ 6600.564034] i915/0 D c07ff1b0 0 295 2 0x00000000
Dec 9 18:00:46 localhost kernel: [ 6600.564042] f6463f04 00000046 f6bacacc c07ff1b0 f6bacd38 c07ff1b0 c07ff1b0 c07ff1b0
Dec 9 18:00:46 localhost kernel: [ 6600.564054] f6bacd38 442269e0 00000581 c07ff1b0 c07ff1b0 ea1c7e00 00000581 f6bacaa0
Dec 9 18:00:46 localhost kernel: [ 6600.564066] f6a8a014 f6a8a018 ffffffff f6463f30 c05620d6 f6bacaa0 f6a8a01c f6bacaa0
Dec 9 18:00:46 localhost kernel: [ 6600.564078] Call Trace:
Dec 9 18:00:46 localhost kernel: [ 6600.564091] [<c05620d6>] __mutex_lock_slowpath+0xc6/0x130
Dec 9 18:00:46 localhost kernel: [ 6600.564098] [<c0561ff0>] mutex_lock+0x20/0x40
Dec 9 18:00:46 localhost kernel: [ 6600.564130] [<f82d4c0a>] i915_gem_retire_work_handler+0x2a/0x70 [i915]
Dec 9 18:00:46 localhost kernel: [ 6600.564138] [<c015459e>] run_workqueue+0x6e/0x140
Dec 9 18:00:46 localhost kernel: [ 6600.564158] [<f82d4be0>] ? i915_gem_retire_work_handler+0x0/0x70 [i915]
Dec 9 18:00:46 localhost kernel: [ 6600.564165] [<c01546f8>] worker_thread+0x88/0xe0
Dec 9 18:00:46 localhost kernel: [ 6600.564171] [<c0158da0>] ? autoremove_wake_function+0x0/0x40
Dec 9 18:00:46 localhost kernel: [ 6600.564177] [<c0154670>] ? worker_thread+0x0/0xe0
Dec 9 18:00:46 localhost kernel: [ 6600.564182] [<c0158aac>] kthread+0x7c/0x90
Dec 9 18:00:46 localhost kernel: [ 6600.564187] [<c0158a30>] ? kthread+0x0/0x90
Dec 9 18:00:46 localhost kernel: [ 6600.564194] [<c0103fc7>] kernel_thread_helper+0x7/0x10