Comment 25 for bug 238105

You can upgrade to intrepid and then to karmic and test new driver.

If the new intel driver doesn't work properly and you want to get old intel (i810) driver back, you don't need to downgrade to hardy, just use driver from hardy:

I expect you have Karmic installed in this point.
Install wajig (sudo apt-get install wajig)
Remove karmic's xserver-xorg with aptitude (aptitude remove xserver-xorg) press Y!
Change repositories temporarily to hardy (sudo sed -i s/karmic/hardy/g /etc/apt/sources.list)
Update package list (sudo apt-get update)
Install xserver-xorg with aptitude (sudo aptitude install xserver-xorg)
Download old driver from hardy and put it to 'hold' with wajig (sudo wajig hold xserver-xorg-video-i810)
Change repos back to karmic (sudo sed -i s/hardy/karmic/g /etc/apt/sources.list)
Now, let's make sure every package is upgraded:
sudo apt-get update
sudo apt-get upgrade
sudo apt-get dist-upgrade
And finally sudo nano /etc/X11/xorg.conf and add/change to Device -section: Driver "i810")

Result should be Ubuntu 9.10 but with old i810 driver running properly.

Please report if that works or doesn't work. I'm using Karmic+i810 with that method.
Thanks goes to: http://forum.ubuntu-fi.org/index.php?topic=24701.msg208685#msg208685