When playing MPEG 1 or 2 streams using mplayer (or mplayer2 or ffplay or mpv)
there is no output, only black rectangle. 

$vdpauinfo declares MPEG support:

MPEG1                16  9216  2048  1152
MPEG2_SIMPLE         16  9216  2048  1152
MPEG2_MAIN           16  9216  2048  1152


Output from ffmpeg shows:
Unsupported PixelFormat xvmcidct (16)
Unsupported PixelFormat xvmcmc (15)

acceleration of h264 works fine, so I conclude that UVD is initialized
succesfully

Radeon Mobility HD 5850

Kernel 3.10.0, libdrm and mesa are from git master (30.06.2013)

sample file: http://samples.mplayerhq.hu/MPEG2/vid_0x80.ts