fullscreen xawtv and tearing...

Hello folks,

	I was hoping someone could help me out.  I have two computers, one
with a single proc P4 on an i845 motherboard, and one with dual proc P3s
on a VIA motherboard.  Both have similar Radeon 8500s in them, and both 
have bt848 cards.

	On the i845 system, if I go fullscreen with xawtv, the picture is 
nice, crisp, and clear.   On the VIA system, if I go full screen with 
xawtv, the entire right side of the picture starts to tear.

	Anyone know what would be causing this problem and how it can be 
fixed?

Adam