The only way I have got tearing to go away is add a section to xorg.conf to disable compositing.
I have tried something similar to Murky's solution without success. I didn't follow his instructions exactly though, so I might give that a whirl and will let you know if I have any success.
I also get tearing with Compiz turned off.
Nvidia ION, Driver version 190.53, Ubuntu 9.10.
The only way I have got tearing to go away is add a section to xorg.conf to disable compositing.
I have tried something similar to Murky's solution without success. I didn't follow his instructions exactly though, so I might give that a whirl and will let you know if I have any success.