Given that it doesn't happen with the proprietary fglrx drivers, it's definitely related to bug #373669. See comments 16 and 17 in that bug.
-- Computer shuts down on heavy CPU usage due to overheating https://bugs.launchpad.net/bugs/595335 You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xserver-xorg-video-ati in ubuntu. _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp