This graphic card is not supported from latest fglrx driver (latest supporting driver is 9.3), and radeon driver working a little bad (resolution is ok, but there is some bad visual effects). I try compiling old 9.3 with maverick.
Radeon 7000 - X1950: Well supported by the free drivers radeon, r200 and r300. Experimental work on a Gallium3D driver for Radeon 9500 - X1950 is in progress under the codename r300g.
Radeon X2000 - X4870: Initial experimental 3D support is available by the free driver r600, and is rapidly improving in the Mesa master branch.
Driver “radeonhd” under development The new radeonhd driver was initially to offer the sole support for R500/R600/R700 cards, but nowadays also the radeon driver supports those. It's therefore overlapping with radeon's card support, and radeonhd might be merged to radeon at some point if there's no use for a separate “newer” driver.
— varo 2010/11/11 18:44
Raw news I found:
New driver gallium as seem as work with 3d and other:
The newest repository that I have to test:
and home of project https://launchpad.net/~xorg-edgers/+archive/ppa
— varo 2010/11/10 18:44
upgrade ubuntu to 11.04, 3d work it!
— varo 2011/07/03 15:42