Thank you for your bug. Could you attach your /var/log/messages, /var/log/syslog and /var/log/Xorg.0.log? Does it happen if you use the ati driver? ** Changed in: gdm (Ubuntu) Importance: Undecided => Medium Status: Unconfirmed => Needs Info -- logout leads to crash (feisty) https://launchpad.net/bugs/94370