To get 3D graphics acceleration on ATI Radeon X1xxx series graphics cards, ATI’s proprietary driver must be installed. Ideally, it should be a simple exercise: download the driver from ATI and follow their installation instructions. However, using the automated installer, I got error messages saying file atiogl_a_dri.so could not be found. Installation reported successful completion, but although the fglrx driver was installed and everything was OK in 2D, there was no 3D acceleration.
The correct way to install the ATI driver is documented in the ATI HOWTO. Basically, you have to build a distribution-specific package and then install that using rpm. At the end you should have full 3D acceleration as witnessed by running fglrxinfo:
display: :0.0 screen: 0
OpenGL vendor string: ATI Technologies Inc.
OpenGL renderer string: ATI Mobility Radeon X1400
OpenGL version string: 2.0.6400 (8.35.5)
Check that you get the same result both as root and a normal user. If you get permission problems with a normal user, edit /etc/X11/xorg.conf, find the section labelled “DRI” and change the Mode line to:
Save the file and restart X.