acer travelmate 7520 display probs

Hi Guys, I have a problem with the display that I have never come across with any other distro. The display is rendering very slowly and “tearing” badly, so much so that it is virtually unusable. The display is very crisp and sharp and looks very good until you, for example, wait for a tool-tip or move a window which can look shattered for up to 20 seconds while it slowly renders back to normal. Even a line typed into the terminal takes several seconds to render…

Anyone else get this?
Edit: forgot to mention, this is suse 11, running on amd dual core 2ghz processor, ati radeon 1250 graphics using 256m of the available 1 gb ram.