I recently installed ubuntu 10.10. Graphics were actually fine, by just using the default drivers, and I could drag windows fast and smoothly.

However, since I have an ATI Radeon HD4870 card I should be able to get more out of it by installing the ATI driver for linux. So, I decided to install the ATI drivers for my radeon 4870.

Now my resolution is fine and everything looks alright, but when I drag windows its not smooth at all and very laggy.

I haven't seen any other implications, although I didn't test any graphic heavy applications. The window dragging is very laggy though and thus a problem.

Any idea what could cause this?