Whenever I use a 3D screensaver, such as the flying toasters, it freezes from waking.
I used envy to install the ATI drivers on my Dell e1505 which uses an ATI x1400 Mobility Radeon. Screen resolution is 1680x1050.
When I had Xubunti 8.10, the 3D screensaver worked fine with the same machine
Also, I'm not use compiz as it causes flickering during video playback.