My freshly installed Natty acts correctly. And recently, the problem disappeared after an update in Maverick too... So I mark this solved, if u like.
** Changed in: xorg-server (Ubuntu) Status: Incomplete => Fix Released -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg-server in Ubuntu. https://bugs.launchpad.net/bugs/728562 Title: Xorg: Frequent SUDDEN logouts make my system unusable _______________________________________________ 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