Comment 102 for bug 201330

It appears that all started with a problem on a Xpress 200 card (bug #197135), an IGP chipset usually found on laptop. The blacklist however is blocking all ati cards on laptops even that ones that are not IGP chips and are very similar to the desktop version (e.g., my RV530 which is available both on desktop and laptop with reduced frequency is working fine in intrepid). Latest xorg and mesa 7.1 ati driver should also have fixed the problems with the Xpress200 (AKA RS480) cards:
http://airlied.livejournal.com/59351.html
there is even a repository with a backported mesa 7.0 to use on 8.04 with these fixes:
https://launchpad.net/~stikonas/+archive

So, I agree to remove the whole blacklist for intrepid and eventually add blacklist on some pci id if some problem will be found.