Hi, mesa maintainers,
I've tried to rebuild mesa 10.0.2-1 from experimental with Michal's patch.
I were interested only in VDPAU and after week of testing I can say that it works fine on my Radeon HD5670. Both mplayer and flashplugin-nonfree use it and there is no visual glitches with it. CPU load also much lower as it was expected.
Please enable VDPAU in mesa packages.