/var/log/daemon.log had:
-----------------------------------
Mar 19 22:41:51 laptop x-session-manager[10605]: WARNING: Detected that screensaver has left the bus
Mar 19 22:41:51 laptop gdm[10560]: WARNING: gdm_slave_xioerror_handler: Fatal X error - Restarting :0
/var/log/daemon.log had: ------- ------- ------- ------- manager[ 10605]: WARNING: Detected that screensaver has left the bus xioerror_ handler: Fatal X error - Restarting :0
-------
Mar 19 22:41:51 laptop x-session-
Mar 19 22:41:51 laptop gdm[10560]: WARNING: gdm_slave_