Could you attach your /var/log/Xorg.0.log (after the crash copy it somewhere so it isn't overwritten) and /etc/X11/xorg.conf.
** Changed in: xorg (Ubuntu)
Sourcepackagename: None => xorg
Status: Unconfirmed => Needs Info
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X crashes when testing screen savers
https://launchpad.net/bugs/95028
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