Odd. Well, when you see a backtrace in the Xorg.0.log that usually means it is the X server (or something lower like the kernel).
Please collect a full backtrace of the X server - see http://wiki.ubuntu.com/X/Backtracing for directions. ** Package changed: emacs23 (Ubuntu) => xorg-server (Ubuntu) ** Changed in: xorg-server (Ubuntu) Importance: Undecided => High ** Changed in: xorg-server (Ubuntu) Status: Confirmed => Incomplete -- 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/917394 Title: xserver restarts when I start emacs To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/917394/+subscriptions _______________________________________________ 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