I guess it is the best to report this issue upstream but please check
this unofficial package
http://people.ubuntu.com/~bryce/Testing/intel/hardy-i386/xserver-xorg-
video-intel_2.3.1-1ubuntu1~bwh3_i386.deb (AMD64
http://people.ubuntu.com/~bryce/Testing/intel/hardy-amd64/xserver-xorg-
video-intel_2.3.1-1ubuntu1~bwh3_amd64.deb) of a newer -intel driver.
To install it you have to remove the old i810 driver before.
sudo apt-get remove xserver-xorg-video-i810 xserver-xorg-video-all
And please regenerate your xorg.conf to be sure.
sudo dpkg-reconfigure xserver-xorg
If you want to reset everything do the follow commands.
sudo apt-get remove xserver-xorg-video-intel
sudo apt-get install xserver-xorg-video-all
If it still doesn't work please attach a current /var/log/Xorg.0.log,
/etc/X11/xorg.conf, the output of >>lspci --vvnn<< and dmesg.
** Changed in: xserver-xorg-video-intel (Ubuntu)
Status: Triaged => Incomplete
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lockup on mac mini 945GM [8086:27a2]
https://bugs.launchpad.net/bugs/218334
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