Comment 35 for bug 110299

You can test a nearly current Intel driver from Debian sid. You have to remove the old i810 driver because the new one doesn't work parallel.
sudo apt-get remove xserver-xorg-video-i810 xserver-xorg-video-all
Download the current driver from http://mirrors.kernel.org/debian/pool/main/x/xserver-xorg-video-intel/xserver-xorg-video-intel_2.3.1-1_i386.deb and install it.
After that restart X and check if your problem is gone. If you have made changes to your xorg.conf generate a new one please (sudo dpkg-reconfigure xserver-xorg) or just remove it to be sure.

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

Afterwards you will have the standard hardy driver again.