Please attach your /var/log/Xorg.0.log.
See if you can reproduce the error using the xrandr command line tool;
if not, it may be a gnome issue rather than X.
See if you can ssh into the machine when it locks up. If ssh does not
work, then it may be a kernel issue.
** Changed in: xserver-xorg-video-intel (Ubuntu)
Sourcepackagename: None => xserver-xorg-video-intel
Status: New => Incomplete
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Changing resolution via "gnome-display-properities" causes screen black and
system lost response
https://bugs.launchpad.net/bugs/261101
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