Colin,
I suspect the spike was not captured in that stack info. But if it was
then it looks like your issue is the the nouveau driver's failure to
sync to vblank. That's a known problem and is fixed by adding to
/etc/X11/xorg.conf:
Section "Device"
Identifier "My Graphics"
Driver "nouveau"
Option "GLXVBlank" "on"
EndSection
But it's only a theory and you probably did miss the spike, in which
case that's not the real problem here.
Since you're using 12.10 however, please try doing a system update
because the new version of compiz (0.9.8.0) was finally released just
over 24 hours ago. It may help with this issue.
** Changed in: compiz (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1044060
Title:
compiz uses 100% cpu seemingly at random but maybe related to update-
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