Download the ATI Radeon drivers ‘fglrx’ from the Synaptic Package Manager.
Edit /etc/X11/xorg.conf:
Add to ‘Section “Module”‘: Load “GLCore”
In ‘Section “Device”‘ change “ati” to “fglrx”
After restaring, check output in glxinfo – direct rendering should be ‘yes’ and ‘renderer string’ should show ‘MOBILITY/RADEON 9000 DDR Generic’
Initially I had errors running glxinfo – this post here explains the problem and provides a fixed (older?) .so file to replace one in the lates fglrx dirver.