Possibly-related video problems

[Ben Novack]

I'm encountering two problems that may or may not be related:

First, I have a GeForce 440MX video card, and I've installed the
nvidia-glx driver, but when GL content - screensavers, specifically -
should be running, I just have a black screen.

Also, video playback in Totem is incredibly pixellated, especially
when I go fullscreen. I'm not playing especially small video; these
are DVDs of 4:3 TV episodes. Is this actually a fixable problem, or is
Totem's resizing aptitude weaker than the proprietary players (like
Apple's DVD Player and WMP) I'm used to? I suspect there's at least
some level of fixability to it, because even when not fullscreened,
things look more pixellated than they should.

Thanks,

---Ben