Thanks....that seems to have done the trick. At least I end up with a working xorg.conf.new. I do still see the following errors though, even if I modprobe via. I received an error about a missing .dep when trying to modprobe openchrome.
(EE) Failed to load module "via" (no error, 0)
(EE) Failed to load module "openchrome" (no error, 0)
Again, I do end up with a working xorg.conf.new, so I'm not sure what, if any, effect these errors might have.