Using intel driver 6.8.0+git20090201.d394e0b8-2 as currently packaged by Ubuntu Karmic, and kernel 2.6.31 from same distro, I see a 100% reliable deadlock. With compiz enabled, after the screen fades to black due to idle timeout, I get this in dmesg: [ 600.840070] INFO: task events/1:10 blocked for more than 120 seconds. [ 600.840078] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 600.840085] events/1 D 0000000000000000 0 10 2 0x00000000 [ 600.840096] ffff88007b3c3d70 0000000000000046 ffff88007b3c3dd0 0000000000015540 [ 600.840107] ffff88007b3c83b0 0000000000015540 0000000000015540 0000000000015540 [ 600.840117] 0000000000015540 ffff88007b3c83b0 0000000000015540 0000000000015540 [ 600.840127] Call Trace: [ 600.840145] [<ffffffff81512c07>] __mutex_lock_slowpath+0xd7/0x160 [ 600.840154] [<ffffffff81512b06>] mutex_lock+0x26/0x50 [ 600.840195] [<ffffffffa005f538>] i915_gem_retire_work_handler+0x38/0x90 [i915] [ 600.840221] [<ffffffffa005f500>] ? i915_gem_retire_work_handler+0x0/0x90 [i915] [ 600.840233] [<ffffffff8106bb15>] run_workqueue+0x95/0x170 [ 600.840240] [<ffffffff8106bc94>] worker_thread+0xa4/0x120 [ 600.840250] [<ffffffff81070e10>] ? autoremove_wake_function+0x0/0x40 [ 600.840258] [<ffffffff8106bbf0>] ? worker_thread+0x0/0x120 [ 600.840266] [<ffffffff81070a26>] kthread+0x96/0xa0 [ 600.840275] [<ffffffff8101308a>] child_rip+0xa/0x20 [ 600.840284] [<ffffffff81070990>] ? kthread+0x0/0xa0 [ 600.840291] [<ffffffff81013080>] ? child_rip+0x0/0x20 [ 600.840322] INFO: task Xorg:2550 blocked for more than 120 seconds. [ 600.840326] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 600.840331] Xorg D 0000000000000000 0 2550 2549 0x00400004 [ 600.840341] ffff880072cb1cb8 0000000000000086 fffffff57a1be000 0000000000015540 [ 600.840351] ffff880078e6b110 0000000000015540 0000000000015540 0000000000015540 [ 600.840361] 0000000000015540 ffff880078e6b110 0000000000015540 0000000000015540 [ 600.840370] Call Trace: [ 600.840380] [<ffffffff81512c07>] __mutex_lock_slowpath+0xd7/0x160 [ 600.840390] [<ffffffff8140c949>] ? sock_aio_read+0x149/0x150 [ 600.840398] [<ffffffff81512b06>] mutex_lock+0x26/0x50 [ 600.840423] [<ffffffffa005f816>] i915_gem_throttle_ioctl+0x36/0x90 [i915] [ 600.840460] [<ffffffffa0026c6e>] drm_ioctl+0x17e/0x3a0 [drm] [ 600.840471] [<ffffffff81114d32>] ? do_sync_read+0xf2/0x130 [ 600.840481] [<ffffffff81070e10>] ? autoremove_wake_function+0x0/0x40 [ 600.840491] [<ffffffff810313f9>] ? default_spin_lock_flags+0x9/0x10 [ 600.840499] [<ffffffff81513eca>] ? _spin_lock_irqsave+0x2a/0x40 [ 600.840508] [<ffffffff81123f5c>] vfs_ioctl+0x7c/0xa0 [ 600.840516] [<ffffffff81124529>] do_vfs_ioctl+0x79/0x370 [ 600.840523] [<ffffffff811248a1>] sys_ioctl+0x81/0xa0 [ 600.840533] [<ffffffff81011fc2>] system_call_fastpath+0x16/0x1b The display is totally hung. No keystroke can turn the display back on, chvt hangs, all X clients hang. However the machine itself continues to work fine, aside from the display. My machine has a 00:02.0 VGA compatible controller: Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller (rev 0c) and I don't have a xorg.conf i.e. I'm using all defaults. Xorg.log attached.
Created attachment 27400 [details] Xorg.log
*** This bug has been marked as a duplicate of bug 22336 ***
This bug is not a duplicate of the other one, but should be fixed in master anyway.
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