I've just sorted out the tearing in videos on my PC following this guide:
http://ubuntuforums.org/showthread.php?t=1390284
However before this i had a wonderfully performing cube, Nice smooth and no/very little tearing (at least only around the sides) Now however the cube feels slow when rotating and i get some sort of tearing (white lines) underneath my gnome panel when 'landing' on a desktop Any ideas how i can return to the previous performance of the cube without turning sync to VBlank off?
The original questioner's comment on nate8nate's answer confirms that Ubuntu "10.10 with the new 260 Nvidia graphics driver" fixes the problems.