This How-to seems to be about 10 years old (tnt2, riva and voodoo3) and describes
a "traditional" multi-card multi-head setup. Please check posting #2 in the following
thread for details on the disadvantages of such configurations (nvidia only):
Originally Posted by ijameni
I am amazed to find through this thread and others that You cant have 1 desktop across 3 / 4 / ++ screens? I am embarrassed for linux!
Option "Xinerama" "0"
Please try "Xinerama" "1"?
BTW., in this context: does somebody know how well gnome can today scope
with multiple X screens (rather than using twinview, TH2G or a mix of both) in
the sense of moving windows across X screen boundaries? Last time I tried
a couple of years ago (I prefer fvmw2), it was not possible to move windows
across screen boundaries without enabling xinerama. Just curious ...