Comment 39 for bug 152648

bsh - Remember that the gdm_slave_xioerror_handler message is a very generic message and could be caused by many different things. That message doesn't contain any useful information and doesn't mean that you're seeing the same crash as other people with that message. The only useful information will be contained in a backtrace of the crashing Xorg process. If the backtrace indicates that you're experiencing a different crash to other people in this bug report, then you need to open a new bug report.

And removing gnome-system-tools will have nothing to do with Xorg crashing.

Thanks