ATI Rage 128
The ATI Rage128 desktop and mobility chips are supported by the DRI. EricAnholt recently added pageflipping support. You can enable pageflipping by adding this to your config:
Option "EnablePageFlip" "true"
It will give you a small boost in performance, but it causes problems for some people.
There is no support for suspend/resume for r128. It shouldn't be too hard to add support. Take a look at the radeon suspend/resume code. I think Xv also needs some fixes for suspend/resume.
Todo: implement hardware-accelerated projective texturing
The register documentation is available on Wikipedia