attempt to change volume causes graphics hang

[Rozisoft]

Ubuntu 9.04
xine X11 GUI 0.99.6

Reproduce:
Running Firefox 3.5 RC3 with two tabs open
Xine playing a .avi movie

Start playing movie and try to raise xine volume w/ Shift+v and everything hangs but the cursor which can still be moved around.

Output of syslog around time of problem:

Jun 27 20:29:43 Rozisoft kernel: [ 362.193341] INFO: task events/0:9 blocked for more than 120 seconds.
Jun 27 20:29:43 Rozisoft kernel: [ 362.193348] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Jun 27 20:29:43 Rozisoft kernel: [ 362.193354] events/0 D 0000002a 0 9 2
Jun 27 20:29:43 Rozisoft kernel: [ 362.193362] f709bf2c 00000046 9aa92c02 0000002a c49cb558 f7096130 c05a9324 c067a520
Jun 27 20:29:43 Rozisoft kernel: [ 362.193376] c067a520 c0677144 c0431e28 f7096130 f70963c4 c49cb520 00000000 00000000
Jun 27 20:29:43 Rozisoft kernel: [ 362.193389] c49cb558 c0431e28 c49cb520 f7096130 00000000 c067a520 c2e7f040 f70963c4
Jun 27 20:29:43 Rozisoft kernel: [ 362.193402] Call Trace:
Jun 27 20:29:43 Rozisoft kernel: [ 362.193416] [<c04286f4>] ? __schedule+0x75f/0x7bc
Jun 27 20:29:43 Rozisoft kernel: [ 362.193424] [<c0137511>] ? lock_timer_base+0x1f/0x3e
Jun 27 20:29:43 Rozisoft kernel: [ 362.193434] [<c0428e33>] __mutex_lock_common+0xdf/0x12f
Jun 27 20:29:43 Rozisoft kernel: [ 362.193441] [<c0428e95>] __mutex_lock_slowpath+0x12/0x15
Jun 27 20:29:43 Rozisoft kernel: [ 362.193448] [<c0428f38>] ? mutex_lock+0x1a/0x28
Jun 27 20:29:43 Rozisoft kernel: [ 362.193455] [<c0428f38>] mutex_lock+0x1a/0x28
Jun 27 20:29:43 Rozisoft kernel: [ 362.193485] [<f854f672>] i915_gem_retire_work_handler+0x22/0x57 [i915]
Jun 27 20:29:43 Rozisoft kernel: [ 362.193493] [<c013ce90>] worker_thread+0x13a/0x1bf
Jun 27 20:29:43 Rozisoft kernel: [ 362.193518] [<f854f650>] ? i915_gem_retire_work_handler+0x0/0x57 [i915]
Jun 27 20:29:43 Rozisoft kernel: [ 362.193527] [<c013ff67>] ? autoremove_wake_function+0x0/0x33
Jun 27 20:29:43 Rozisoft kernel: [ 362.193534] [<c013cd56>] ? worker_thread+0x0/0x1bf
Jun 27 20:29:43 Rozisoft kernel: [ 362.193541] [<c013fc70>] kthread+0x45/0x6b
Jun 27 20:29:43 Rozisoft kernel: [ 362.193548] [<c013fc2b>] ? kthread+0x0/0x6b