The Radeon Mobility graphics chipset in Compaq Presario 2100US notebooks seems to have some major quirks with the "ati" X video driver. I've finally managed to find a configuration that works perfectly and enables 3D graphics support. The configuration also works with the Beryl compositor. This is tested with Ubuntu Linux 7.04.

Here is the xorg.conf configuration file I am using.

Labels: ati, compaq, linux, presario, unix, x11, xorg