I saw an answer to this somewhere, I'll see if I can dig it up. What card are you using btw, just in case?
Edit: Found a couple links to start off, both seem appropriate. I'll keep looking for the one I saw that was a pretty awesome guide for both nvidia and ati, and also covered some various desktops.
In the mean time..
Related to Kubuntu 5.04 and using ATI (but generally applicable)
http://www.granneman.com/techinfo/li...lheadhowto.htm
Some generally helpful tips. (Ubuntu, Fedora, etc..)
http://www.linuxquestions.org/questi...nitors-689888/