Same problem for me Dell inspiron 1525, intel graphics. No direct trigger which caused it for me, just watching videos with totem As pulseaudio was mentioned earlier, looked through syslog for anything around that time and found the following:
May 30 13:45:37 omega pulseaudio[8665]: pid.c: Stale PID file, overwriting. May 30 13:45:37 omega acpid: client 1259[0:0] has disconnected May 30 13:45:37 omega acpid: client connected from 8667[0:0] May 30 13:45:37 omega acpid: 1 client rule loaded May 30 13:45:37 omega pulseaudio[8665]: main.c: Unable to contact D-Bus: org.freedesktop.DBus.Error.NoServer: Failed to connect to socket /tmp/dbus-j1K13uOC5O: Connection refused -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/778490 Title: Random logout after upgrading to Natty Narwhal 11.04 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
