I am getting near-constant screen tearing when watching videos on my Ideapad Y400, with Nvidia GT 650M graphics (not the SLI model).
I am using the proprietary 337 drivers from xorg-edgers, but the same effects happened with 304 (and 313, I think). I use Ubuntu 13.10 and i3wm.
Enabling and disabling OpenGL Vsync in nvidia-settings makes no difference. I don't see any other relevant options. I have tried both VLC and the built-in "videos" application, and both suffer screen tearing. The tearing does not occur when I run Windows. I have not tried another monitor, as I can't get hdmi-out to work (I haven't tried VGA).
Do y'all have any ideas?
Note: As I have swapped among various versions of Noveau and proprietary drivers, the tty's have changed appearance a bit. At the moment, they appear to be correct except for two vertical lines of slight blurriness -- 2px off from the right horizontal resolution?