Well, I can't offer anything new, just wanted to note that I went through exactly the same stuff as andysan. I'm writing this on a X server running the nv driver, silently cursing Samsung for their bloody flat panel. One suggestion: is it possible to tell the nvidia driver to just leave the flat panel alone? Whatever the nv driver does to the DFP port obviously doesn't mess it up. The kernel module has an option FlatPanelMode.. what does this one do?