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bbfa235
(Get the code!)
I might have the same problem. For me it seems to be composite related. So Xorg uses full CPU when composite is enabled and running. So either disabling composite in xorg.conf or suspending it (Shift-Alt-F12 with KDE4 Kwin) gives normal CPU usage. Resuming it lets it go up again to 100%.
I did not have this problem with my nvidia card and proprietary drivers.
I can't check the fglrx driver as my card is not supported anymore.
I'm using Jaunty, and the card is an Radeon R420