Re: nVidia driver 1.0-96xx causes glitches, artifacts and crashes on Ubuntu Edgy/Feisty
Interesting. I have the 6600GT as well and it runs flawlessly on my AMD64 PC (which is using an ATI chipset mobo no less!) I didn't see your kernel option line -- make sure you have "noagp" in there as this is a PCI-E card and the kernel doesn't always do the right thing when auto-detecting. There was the MMIO error in there as well that should be resolved.
The nv driver is somewhat accelerated 2D and doesn't do hardward 3D. That GLXGEARs runs with it is rather meaningless as if GLXGEARS didn't render through MESA (which supplied GLXGEARS in the first place) I would be rather worried. (It's part of their demo suite.) What is interesting is that there appears to be a pattern to the corruption in the screen shots you sent. Does the problem always present itself in the same manner?