Ah, and I don't know if its normal or not and pertaining to that issue or not
(maybe that confuses something else in the driver). But I can't seem to get
vsync working. Earlier I used "EXAVsync" and that was that. But now even it
doesn't help and I'm getting stuff like:
Running synchronized to the vertical refresh.  The framerate should be
approximately the same as the monitor refresh rate.
20074 frames in 5.0 seconds = 4014.652 FPS

Doesn't work under both EXA and glamor. Don't quite know when it changed. 
It does work however with bleeding edge X stack + mesa 10.7~git and "TearFree"
option but with it
1) clock speed and voltage are always on maximum
2) mpv/bomi are slowly desynchronizing audio and video