Features

Screen Rotation
ATI Linux drivers do not rotate screens natively. In other words, Linux users currently are unable to rotate their screens without extreme slowness. The Windows version works beautifully.

Open Source Drivers
ATI Radeon cards 8500,9000,9200 and 9250 working with open source drivers provide OpenGL 3D graphics acceleration.

Proprietary Drivers
Proprietary drivers can be used instead, if so desired, although it is not necessary to use these for the cards listed above.

X server

 * XFree86 and X.org support

Xaa

 * X Acceleration Architecture

Xv

 * One Hardware or OpenGL overlay

TV Out

 * NTSC and PAL support

TV In
(No support)
 * Support for the built in tuner in "All-in-Wonder" cards.

OpenGL
BUT NOT the OpenGL 2.0 version of the shading language.
 * Provides some OpenGL 2.0 commands

The ATI driver uses a version of the shading language called the ARB extension. The ARB extension was used before OpenGL 2.0 was finished.