Maybe this bug is related to https://bugs.launchpad.net/ubuntu/+bug/140554 . Sounds similar just without the user switching.
-- gdm_slave_xioerror_handler: Fatal X error https://bugs.launchpad.net/bugs/152648 You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is a bug contact for gdm in ubuntu. -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
