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[j^ <j@xxxxxxxxx>]

more errors in dmesg trying to restart X via /etc/init.d/gdm restart
does not work

[  360.744203] INFO: task i915/0:841 blocked for more than 120 seconds.
[  360.744219] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[  360.744232] i915/0        D c080c380     0   841      2 0x00000000
[  360.744253]  f68a3f04 00000046 f68dc000 c080c380 f6806718 c080c380 e71988b2 00000020
[  360.744282]  c080c380 c080c380 f6806718 c080c380 00000000 00000020 c080c380 f5f75340
[  360.744309]  f6806480 f691c014 f691c018 ffffffff f68a3f30 c0568e26 c0737180 f691c01c
[  360.744336] Call Trace:
[  360.744365]  [<c0568e26>] __mutex_lock_slowpath+0xc6/0x130
[  360.744382]  [<c0568d40>] mutex_lock+0x20/0x40
[  360.744450]  [<f824e94a>] i915_gem_retire_work_handler+0x2a/0x70 [i915]
[  360.744483]  [<c015311e>] run_workqueue+0x6e/0x140
[  360.744539]  [<f824e920>] ? i915_gem_retire_work_handler+0x0/0x70 [i915]
[  360.744569]  [<c0153278>] worker_thread+0x88/0xe0
[  360.744590]  [<c0157920>] ? autoremove_wake_function+0x0/0x40
[  360.744610]  [<c01531f0>] ? worker_thread+0x0/0xe0
[  360.744623]  [<c015762c>] kthread+0x7c/0x90
[  360.744637]  [<c01575b0>] ? kthread+0x0/0x90
[  360.744654]  [<c0103f17>] kernel_thread_helper+0x7/0x10
[  360.744704] INFO: task Xorg:2480 blocked for more than 120 seconds.
[  360.744714] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[  360.744724] Xorg          D c080c380     0  2480   2479 0x00400004
[  360.744743]  f5da3e28 00003082 00000000 c080c380 f662c168 c080c380 bddf3835 00000020
[  360.744770]  c080c380 c080c380 f662c168 c080c380 bddedbed 00000020 c080c380 f6712c40
[  360.744798]  f662bed0 f691c014 f691c018 ffffffff f5da3e54 c0568e26 00000000 f691c01c
[  360.744824] Call Trace:
[  360.744841]  [<c0568e26>] __mutex_lock_slowpath+0xc6/0x130
[  360.744857]  [<c0568d40>] mutex_lock+0x20/0x40
[  360.744914]  [<f824ebcb>] i915_gem_throttle_ioctl+0x2b/0x70 [i915]
[  360.744932]  [<c01e43a5>] ? do_sync_readv_writev+0xb5/0xf0
[  360.745003]  [<f81466c0>] drm_ioctl+0x180/0x360 [drm]
[  360.745093]  [<f824eba0>] ? i915_gem_throttle_ioctl+0x0/0x70 [i915]
[  360.745121]  [<c02c4c4f>] ? security_file_permission+0xf/0x20
[  360.745142]  [<c01e463f>] ? rw_verify_area+0x5f/0xe0
[  360.745157]  [<c01e4a88>] ? rw_copy_check_uvector+0x78/0xf0
[  360.745174]  [<c01244f8>] ? default_spin_lock_flags+0x8/0x10
[  360.745191]  [<c015aaa5>] ? __remove_hrtimer+0x25/0x70
[  360.745207]  [<c015b303>] ? hrtimer_try_to_cancel+0x33/0x80
[  360.745225]  [<c0144b2e>] ? do_setitimer+0x23e/0x300
[  360.745252]  [<c01f1fa3>] vfs_ioctl+0x73/0x90
[  360.745267]  [<c01f2271>] do_vfs_ioctl+0x71/0x310
[  360.745283]  [<c0144c2b>] ? sys_setitimer+0x3b/0x90
[  360.745297]  [<c01f256f>] sys_ioctl+0x5f/0x80
[  360.745312]  [<c010334c>] syscall_call+0x7/0xb

-- 
attaching external monitor: laptop display shows corrupted desktop
https://bugs.launchpad.net/bugs/419328
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