Given the "I experienced the same problem last week on my iMac Indigo" comment, I think this can be called confirmed.
** Changed in: xorg-server (Ubuntu) Status: Unconfirmed => Confirmed -- 2.6.12 and above create 100% CPU with xorg on iMac https://launchpad.net/bugs/22667 -- kubuntu-bugs mailing list kubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/kubuntu-bugs