Note that downgrading to 2.7 is a last resort and seldom very useful. With 2.7 (and Jaunty) DRI was disabled for i8xx cards, so you might as well run with latest 2.9 but disable DRI if you have trouble with your i8xx card. A minimal xorg.conf for this would be:
Section "Device"
Identifier "my-old-i8xx"
Driver "intel"
Option "DRI" "off"
EndSection
Note that downgrading to 2.7 is a last resort and seldom very useful. With 2.7 (and Jaunty) DRI was disabled for i8xx cards, so you might as well run with latest 2.9 but disable DRI if you have trouble with your i8xx card. A minimal xorg.conf for this would be:
Section "Device"
Identifier "my-old-i8xx"
Driver "intel"
Option "DRI" "off"
EndSection