Xorg on my also used 100% of one of cores. But I was not able to solve this 
without recompiling packages.
 * Nothing changed if I killed gnome-power-manager or gnome-settings-daemon.
 * I downgraded libxrandr to intrepid version, and the related packages - no 
change.
 * Removed libgnome-desktop-11 in favor of libgnome-desktop-7 and downgraded 
many gnome packages to intrepid version, although they were working mostly fine 
for a couple of weeks.

Strangely enough, only after I downgraded gnome-session, the high cpu
use by xorg has stopped.

Dell XPS 1330 using nvidia x drivers so intrepid xorg, other than that
mostly jaunty packages.

-- 
upgrade to 2:1.2.99.2-0ubuntu1 makes session utterly slow
https://bugs.launchpad.net/bugs/307306
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