I'm a fairly noob ubuntu user, but since xbmc xvba tree has been discontinued for saucy, I was left without an option for running HD content on xbmc on my brazos E-350 based machine.
I have recently installed kernel 3.13 RC2 and Oibaf's PPA and tried a few terminal commands mentioned on the previous comments to verify if UVD is functionning. Apparently it is, but I get a lot of stutering on HD videos both on xbmc 12.2 and vdpau acceleration on. Is there something I'm missing?
Thank you very much for the hint. Completely forgot that xbmc required patches to use vdpau on radeon. Unfortunatly the xbmc version on the ppa recommended on that link is completly broken at this time. I guess I'll have to wait until it all settles down anyway... In the meantime, is there any media player that already works on radeon-vdpau?