[dman]

At some arbitrary time in the past I did use the xorg server from this ppa https://launchpad.net/~ubuntu-x-swat/+archive/xserver-no-bac... when I was using compiz and things were slow on an ati card. I dont know if that ppa is updated for lucid but you could give it a try. If youre using it as a htpc you can disable compiz no ? I mean in most cases wouldnt you want to directly boot into mythtv / xbmc ? Also can you specify what card are you using ? If its x1xxx series or earlier then youre beyond the support window (the closed source driver is only for newer cards) and you might be better off using the radeonhd driver. I think I should do a write up on how to setup ati drivers on linux the right way. It takes < 5 mins to get a dual head display with auto detection going these days. HINT: aticonfig is your friend.