This looks like an X.org driver or kernel bug.

Do you get the issue as well if you do normal user switching? Can you
still ping the computer from another computer in the network (ping
computername.local), and/or ssh into it (apt-get install openssh-server
on the W500, then cause the lock, then "ssh
[email protected]" from another computer)?

Can you please attach /var/log/Xorg.0.log.old and /var/log/kern.log
immediately after a reboot (after it hung)?

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Selecting 'Guest session' from Fast User Switch applet locks up laptop
https://bugs.launchpad.net/bugs/311984
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