Re: Tearing and Composite
I tried setting the variable you provided and still had the tearing. Additionally, then, I set two others I found documentation on (just for testing): "GL_SYNC_DISPLAY_DEVICE" and "GL_SYNC_TO_VBLANK" (even though I believe these are already handled via my nvidia-settings rc file).
In any case... I have the same horizontal descending tear, sadly.
Since it seems (or at least the impression I get is) that this is not related to the mplayer black window thing, I am personally going to just focus on the tearing thing for now.
Didn't want to provide useless data, should I run another bug report?