nvidia: tearing artifacts

[Stefan Ehmann]

Starting some weeks ago, I noticed annoying tearing artifacts [1] during 
video playback

At first I suspected the recent nvidia-driver update, but a downgrade 
doesn't help. I'm using x11/nvidia-driver-340 on FreeBSD 10.2 (amd64).

IIRC I already had this problem several years ago. It was fixed by 
setting SyncToVBlank=1 via nvidia-settings. But that no longer helps.

In mplayer, tearing doesn't occur if I set the output driver to
gl oder vdpau.

Any ideas what causes this behavior how to fix it?


[1] https://en.wikipedia.org/wiki/Screen_tearing

-- 
Stefan