You may find more data on older Radeon chipsets here:
SUPPORTATI/RadeonAnd more:
Gentoo WIKI (Radeon)If not successful -try posting your X-Org Cfg settings
Plse Note: To dispel unintentional mis-conceptions
when using the xorg drivers
X-Org does NOT have "own" drivers - uses whatever is presently available in users X-libraries
That may be 'generic' such as
nv
X-vesa
frame-buffer
ati (as specified in the "device" section of xorg.conf)
OR - For newer chipsets ~ OEMs proprietary kernel wrappers
For ATI - DRI & glx should be enabled If enhaced options (extensions) available_
~ Plse see relevant documentation for each driver
For older cards & non-accelerated use - Plse see use of Mesa
Errata:
HOW X WORKSHTH