See if this mesa package reduces the frequency of the freezes:
https://edge.launchpad.net/~bryceharrington/+archive/purple
** Changed in: xserver-xorg-video-intel (Ubuntu)
Importance: Undecided => High
** Changed in: xserver-xorg-video-intel (Ubuntu)
Status: New => Triaged
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[i965 X3100] X freezes/crashes randomly, only mouse pointer still functional
https://bugs.launchpad.net/bugs/345119
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