I’ve got an old Compaq nc6220 Laptop and recently I had installed Ubuntu Jaunty. First all was working OK including Graphics, I don’t had any problem with advanced effects. But then automatic updates and no more advanced Graphics.
It seems that something screw up the xorg.conf and set all to Defaults, if this happens to you then you have to check if you have the correct drivers already installed:
aptitude show xserver-xorg-video-intel
if not install it…
then you have to add/change Driver to “intel”