https://bugs.freedesktop.org/show_bug.cgi?id=84519
--- Comment #3 from Martin Bednar serafean@gmail.com --- (In reply to Lee Donaghy from comment #2)
If you're having problems playing back mpeg2 the XBMC devs recommend turning off vdpau acceleration for mpeg2. settings, video, acceleration. then untick 'Use MPEG-2 VDPAU', need to change the settings level to expert to see it listed. Not sure if the latest XBMC has this option or you might have to upgrade to Kodi.
Thanks, did that, works. However, I still think that a userspace program shouldn't be able to hang the GPU so completely as to warrant a reboot.