Comment 17 for bug 306605

Downgrading xorg to the version in Intrepid seems to solve the problem, however it lead's to a high cpu load. This is what I did:
* apt-get remove 'xserver-*'
* Replaced 'jaunty' by 'intrepid' in /etc/apt/sources.list
* apt-get update
* apt-get install 'xserver-*'
* Restored original /etc/apt/sources.list
* apt-get update
* reboot
After the reboot, there were no more artefacts (In fact, I saw artefacts, but much less). However, xorg used 50% of one cpu core all the time.