I had the same problem in 12.04. I was able to resolve it by removing xfs from the font path in xorg.conf.
# FontPath "unix/:7100" FontPath "/usr/share/fonts/X11/misc" FontPath "/usr/share/fonts/X11/Type1" This may be related to bug #738526. -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to nvidia-graphics-drivers in Ubuntu. https://bugs.launchpad.net/bugs/930350 Title: xorg.conf plus emacs causes abrupt logout via Xorg SEGV To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers/+bug/930350/+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