PleegWat wrote: > If I'm reading the manpage correctly (man xorg.conf) the 'Display' subsection should have one or more 'Modes' lines describing allowed screen resolutions. Nvidia doesn't generate any, and I'm not sure the directive is supported here by nvidia at all. Correct, that's the source of your problems. You'll have to read Nvidia's manual on how to generate meta modes for twinview. Or you can use external programs that generate xorg.conf like sax2 for example.
