2013-08-22, 18:19 (This post was last modified: 2013-08-22, 18:19 by fritsch.)
You cannot sync to display, if some compositing wm implements uses triple buffering. And in that case it seems, that vaapi gets serious problems (see your log).
First decide what functions / features you expect from a system. Then decide for the hardware. Don't waste your money on crap.