How to use xf86-video-ati with HD6850 (with KMS)

[Death Knight]

And while compiling Mesa, do not forget to DISABLE GALLIUM.
r600c is much faster and reliable than r600g.

[Xipeos]

And while compiling Mesa, do not forget to DISABLE GALLIUM.
r600c is much faster and reliable than r600g.

There's no need for that, unless you simply want less compilation time. The "dri-r600g" target is not built by default - you have to explicitly enable it with --enable-gallium-r600 (and even then it's not used by default, even if r600c is not built).