Fixing Intel driver in Jaunty on Acer Aspire One 4
Since Jaunty was released, most computers with Intel GPU have suffered from dismall video performances. It's not only about videos, it's also about browsing the web with Firefox, scrolling through pages is slow, sometimes blocks, and compiz effects suffer from occasional flashes.
This fix is for the AAO D150 which is equipped with Intel 945GM.
# lspci | grep 945 00:00.0 Host bridge: Intel Corporation Mobile 945GME Express Memory Controller Hub (rev 03) 00:02.0 VGA compatible controller: Intel Corporation Mobile 945GME Express Integrated Graphics Controller (rev 03) 00:02.1 Display controller: Intel Corporation Mobile 945GM/GMS/GME, 943/940GML Express Integrated Graphics Controller (rev 03)
I tried several things. I started experimenting with the instructions at Jaunty Intel Graphics Performances Guide (safe solution) but it didn't help, if anything it got worse.
Then I reverted to the regular driver (aptitude was of great help here, I used "aptitude remove xserver-xorg-video-intel" and it kindly offered me to downgrade to the regular jaunty version instead of completely removing the package).
I found that page that explains how to revert to version 2.4 of the driver. The instructions in the article work just fine and after restarting X, the video performances are back to normal. In short:
Add to /etc/apt-sources.list:
deb http://ppa.launchpad.net/siretart/ppa/ubuntu jaunty main
Add the server key:
sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 0xce90d8983e731f79
Install the 2.4 package:
sudo aptitude install xserver-xorg-video-intel-2.4
Restart X and you're done.

Thanks! This worked for me too for my Thinkpad X61 and Jaunty 32 bit.
OMG! It also worked in my Jaunty 32 bit. Thanks... ;)
Thanks. This worked in UNR 9.04 on my Acer Aspire One ZG5
One step is missing... after adding the repository, you must type: sudo apt-get update to refresh the apps. Then you can install the intel driver