Please include your /var/log/Xorg.0.log.
Offhand, this sounds like the pipe-A problem. Try setting this option
in your xorg.conf:
Section "Device"
...
Option "ForceEnablePipeA" "true"
EndSection
If that solves the issue let me know and I can put in a quirk for it.
** Changed in: xserver-xorg-video-intel (Ubuntu)
Status: New => Incomplete
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Dell C400 (i830) freezes in Hardy
https://bugs.launchpad.net/bugs/267570
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