Re: Freeze/X lockup during VDPAU playback
Here's a bug report and vdpau trace when the X hang occured.
It's pretty easy to reproduce: KDE-4.6, firefox and a few xterms on one virtual desktop,
place a few other xterms on another virtual desktop, start mplayer fullscreen on a second head, direct kwin to pin it to all desktops and start switching between desktops with the slide effect.
It's much harder to reproduce when KDE desktop effects are disabled.