This is a fglrx bug, kas_spin_lock and KAS_GetExecutionLevel are totally
not preempt safe. Unfortunately this is most likely hurting your GPU
performance and you would be better off using the -generic kernel. I see
you are on a laptop as well, and the preempt kernel very negatively
impacts your battery life if that is an issue so that's could be another
reason to use the standard kernel.
** Package changed: linux (Ubuntu) => fglrx-installer (Ubuntu)
** Changed in: fglrx-installer (Ubuntu)
Importance: Undecided => Medium
** Changed in: fglrx-installer (Ubuntu)
Status: New => Confirmed
--
BUG: using smp_processor_id() in preemptible [00000000] code: Xorg/1157
https://bugs.launchpad.net/bugs/560571
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which is subscribed to fglrx-installer in ubuntu.
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