Debian sarge (kernel 2.6.9) & nvidia driver 1.0-6629

[Void Main]

I'm really at a loss. It should be working as far as I can tell, unless you do have some sort of problem with your XF86Config-4 that I'm not spotting. The only thing I can think of to suggest is to go to the NV forums and plead for help:

http://nvnews.net/vbulletin/showthread.php?t=43702

There are a few people there that really know what they are doing if you are lucky enough to catch their eye with a detailed post and subject.