https://bugs.freedesktop.org/show_bug.cgi?id=77677
--- Comment #20 from Andy Furniss adf.lists@gmail.com --- (In reply to comment #19)
With mplayer as long as there is video it seems to work OK (20 mins longest test so far).
This turned out not to be correct - I was testing with HD video and they do work - but SD will fail.
I posted to the mplayer list and one of the devs thought it sounded like a reclocking issue and suggested I try playing audio while running glxgears.
With vblank_mode=0 it does help but not totally cure, the audio progresses normally as opposed to being mostly stuck, but is still distorted.
Running a nexuiz timedemo, however totally cures it!
So it seems that loading up my system is the way to fix and why my HD vids worked but failed with UVD.
I have tried disabling cpufreq on_demand and also forcing dpm auto/low/high, but there is no difference - I need load to make it work.