Comment 25 for bug 537640

The radeon.new_pll=0 kernel line works on my ATI X1600 (HP nc8430 laptop). The 3d and desktop effects are not working with this trick.

Strange thing is: If I use my TFT monitor as a second screen in a dual head setup and
don't use the kernel line, the laptop screen is ok. TFT monitor is not ok, shows horizontal scrolling. So I disabled my second screen, and now the laptop screen is ok (with 3d effects/compiz).