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[saglio <599337@xxxxxxxxxxxxxxxxxx>]

Sys Updated regularly, currently 2.6.31-22-generic, Gnome 2.28.1

I just had a system freezed, during a pause with screen saver active
and, by chance a cron task just before (or after) gave me this:

Sep  1 14:17:01 evo21-desktop CRON[2861]: (root) CMD (   cd / && run-parts --report /etc/cron.hourly)
Sep  1 14:17:50 evo21-desktop kernel: [14520.544037] INFO: task i915/0:232 blocked for more than 120 seconds.
Sep  1 14:17:50 evo21-desktop kernel: [14520.544045] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Sep  1 14:17:50 evo21-desktop kernel: [14520.544050] i915/0        D c081b5c0     0   232      2 0x00000000
Sep  1 14:17:50 evo21-desktop kernel: [14520.544059]  f6a6df04 00000046 f6a025dc c081b5c0 f6a02848 c081b5c0 53218d0d 00000c44
Sep  1 14:17:50 evo21-desktop kernel: [14520.544070]  c081b5c0 c081b5c0 f6a02848 c081b5c0 53217a8e 00000c44 c081b5c0 ed898200
Sep  1 14:17:50 evo21-desktop kernel: [14520.544081]  f6a025b0 f6886c14 f6886c18 ffffffff f6a6df30 c0574136 c074ee80 f6886c1c
Sep  1 14:17:50 evo21-desktop kernel: [14520.544092] Call Trace:
Sep  1 14:17:50 evo21-desktop kernel: [14520.544112]  [<c0574136>] __mutex_lock_slowpath+0xc6/0x130
Sep  1 14:17:50 evo21-desktop kernel: [14520.544119]  [<c0574050>] mutex_lock+0x20/0x40
Sep  1 14:17:50 evo21-desktop kernel: [14520.544162]  [<f81af8fa>] i915_gem_retire_work_handler+0x2a/0x70 [i915]
Sep  1 14:17:50 evo21-desktop kernel: [14520.544173]  [<c01579be>] run_workqueue+0x6e/0x140
Sep  1 14:17:50 evo21-desktop kernel: [14520.544191]  [<f81af8d0>] ? i915_gem_retire_work_handler+0x0/0x70 [i915]
Sep  1 14:17:50 evo21-desktop kernel: [14520.544198]  [<c0157b18>] worker_thread+0x88/0xe0
Sep  1 14:17:50 evo21-desktop kernel: [14520.544206]  [<c015c160>] ? autoremove_wake_function+0x0/0x40
Sep  1 14:17:50 evo21-desktop kernel: [14520.544213]  [<c0157a90>] ? worker_thread+0x0/0xe0
Sep  1 14:17:50 evo21-desktop kernel: [14520.544218]  [<c015be6c>] kthread+0x7c/0x90
Sep  1 14:17:50 evo21-desktop kernel: [14520.544224]  [<c015bdf0>] ? kthread+0x0/0x90
Sep  1 14:17:50 evo21-desktop kernel: [14520.544231]  [<c0104047>] kernel_thread_helper+0x7/0x10

Then I did the classic Alt-Syst R S E I U B
Sep  1 14:23:22 evo21-desktop kernel: [14852.419863] SysRq : Keyboard mode set to system default
Sep  1 14:23:27 evo21-desktop kernel: [14857.427126] SysRq : Emergency Sync
Sep  1 14:23:27 evo21-desktop kernel: [14857.427313] Emergency Sync complete
Sep  1 14:23:29 evo21-desktop kernel: Kernel logging (proc) stopped.

-- 
system freezed (keyboard mute) after a very short time navigating
https://bugs.launchpad.net/bugs/599337
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