Hi,
I have a question about the XF86Config-4 file. How can so many "modeline" options exist in the one configuration file? How does the computer deal with them?
I mean take an example
I have about 20 to thirty of these in XF86Config-4, all giving different parameters.
Sure, the resolution line has a hash, so that means it's ignored? So maybe it's a comment. But the modeline is not hashed, so what does the comùter do with so many of them?
Surely, for optimimum performance, we should be specifying just one modeline for our monitor...
I ask all this without really knowing what a modeline does ... so if you know, pelase tell.

All I can tell you from my reading of the manuals (in search of Twinview info) is that xorg.conf does not need mode lines at all. Go take a gander at the http://xtiming.sourceforge.net/cgi-bin/xtiming.pl page for as much knowledge as you can take.