Comment 9 for bug 451518

I can confirm this bug on an with an Intel D945GCLF, X never frozen here but the attached monitor is only recognized as 800x600 which is not true at all.

[ 44.456967] i2c-adapter i2c-0: unable to read EDID block.
[ 44.456976] i915 0000:00:02.0: VGA-1: no EDID data
[ 44.566577] [drm:edid_is_valid] *ERROR* Raw EDID:
[ 44.566590] <3>1f ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................
[ 44.566596] <3>ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................
[ 44.566602] <3>ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................
[ 44.566608] <3>ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................
[ 44.566614] <3>ff ff ff ff ff ff ff ff ff ff ff ff 00 00 00 00 ................
[ 44.566620] <3>00 00 00 07 ff ff ff ff ff ff ff ff ff ff ff ff ................
[ 44.566626] <3>ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................
[ 44.566632] <3>ff ff ff ff ff ff ff ff ff f0 00 00 00 00 00 00 ................
[ 44.566636]
[ 44.566643] i915 0000:00:02.0: VGA-1: EDID invalid.
[ 44.841705] [drm:i915_wait_request] *ERROR* something (likely vbetool) disabled interrupts, re-enabling
[ 360.692039] INFO: task i915/1:292 blocked for more than 120 seconds.
[ 360.692048] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 360.692055] i915/1 D c08145c0 0 292 2 0x00000000
[ 360.692065] f646bf04 00000046 00000000 c08145c0 f6958f28 c08145c0 616ea364 00000026
[ 360.692081] c08145c0 c08145c0 f6958f28 c08145c0 616e8c81 00000026 c08145c0 f6a5a1c0
[ 360.692095] f6958c90 f68c9c14 f68c9c18 ffffffff f646bf30 c056f776 f695f110 f68c9c1c
[ 360.692109] Call Trace:
[ 360.692125] [<c056f776>] __mutex_lock_slowpath+0xc6/0x130
[ 360.692133] [<c056f690>] mutex_lock+0x20/0x40
[ 360.692183] [<f8277c0a>] i915_gem_retire_work_handler+0x2a/0x70 [i915]
[ 360.692194] [<c0157a7e>] run_workqueue+0x6e/0x140
[ 360.692233] [<f8277be0>] ? i915_gem_retire_work_handler+0x0/0x70 [i915]
[ 360.692242] [<c0157bd8>] worker_thread+0x88/0xe0
[ 360.692251] [<c015c280>] ? autoremove_wake_function+0x0/0x40
[ 360.692259] [<c0157b50>] ? worker_thread+0x0/0xe0
[ 360.692267] [<c015bf8c>] kthread+0x7c/0x90
[ 360.692274] [<c015bf10>] ? kthread+0x0/0x90
[ 360.692282] [<c0104007>] kernel_thread_helper+0x7/0x10