I have one Ati radeon HD 5730 in my laptop and a AMD radeon HD 6870 in my desktop.
I think the new 6XXX series is supported but just with kernel 2.6.38, it's is \testing from current.
But no 3D, because needs gallium support and it's not very stable.
The best idea is stick in AMD drivers, I use it and have no complains.
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