This seems to be related to auto-login feature of KDE; disabling it fixes the issue.
-- X crashes a few minutes after auto logging-in https://bugs.launchpad.net/bugs/662849 You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg-server 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