I turned the compositor off and set the graphic cards profile to "performance" (was "auto") before I started the demo. For some reason I get tearing in videos (

I turned the compositor off and set the graphic cards profile to "performance" (was "auto") before I started the demo. For some reason I get tearing in videos (mplayer or vlc - no matter which output module) when I don't set the profile to performance as well. I don't get tearing in flash or html5 videos (chrome, no matter if compositor or not or if performance or auto)!