Created attachment 84984 [details]
16 re-frames video decoding (and probably also 12 re-frames) stutter on UVD with radeon driver (same video is decoded fine with fglrx driver via XvBA). mplayer2 with enabled VDPAU is used for this test.
16 re-frames sample: http://www.mediafire.com/?tdukvcaj87nivn7
Radeon HD 6310
Linux 3.11 with drm-next from this folder: http://kernel.ubuntu.com/~kernel-ppa/mainline/drm-next/current/ (build 3.11.0-996.201308300442). radeon.dpm is enabled.
Ubuntu 13.04 x86_64
Driver, Mesa and firmwares installed from this PPA: https://launchpad.net/~oibaf/+archive/graphics-drivers
dmesg output attached.
vdpauinfo output attached.
Created attachment 84988 [details]
Not reproducible anymore with current Mesa git and XBMC git.