I ran the ubuntu-bug xorg and the output is https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/999191
It started happening after upgrading to ubuntu 12.04. Several times a day, the gnome session crashes and drops me to GDM. This happens with Unity and gnome shell. It doesn't happen with unity-2d. Part of the syslog output: May 14 17:17:01 CRON[15229]: (root) CMD ( cd / && run-parts --report /etc/cron.hourly) May 14 17:23:20 gnome-session[11249]: Gdk-WARNING: gnome-session: Fatal IO error 11 (Resource temporarily unavailable) on X server :2.#012 May 14 17:23:20 acpid: client 11075[0:0] has disconnected May 14 17:23:20 acpid: client 11075[0:0] has disconnected May 14 17:23:20 acpid: client connected from 15281[0:0] May 14 17:23:20 acpid: 1 client rule loaded May 14 17:23:20 acpid: client connected from 15281[0:0] May 14 17:23:20 acpid: 1 client rule loaded -- 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/907383 Title: Spontaneously eject from the session To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers/+bug/907383/+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