Dual monitor setups on GNU/Linux are known to be great fun! After fiddling with my xorg.conf for a couple of days, I've managed to come to a point where I can get pretty much what I want (two screens next to each other, windows draggable from one screen to the other) by starting up X, and then manually calling:
xrandr --output CRT2 --right-of DFP2
I'm using RandR 1.3 because Xinerama does not work for my setup (and seems to be obsolete in a way, too).
According to this website, I should be able to achieve the same effect statically through my xorg.conf - however, I don't seem to get it working correctly.
I'm using the fglrx driver for my ATI card, GNOME 2.32.1, and here is my xorg.conf:
Section "ServerFlags" Option "RandR" "on" EndSection Section "Device" Identifier "Device" Driver "fglrx" BusID "PCI:1:0:0" Option "Monitor-DFP2" "Monitor0" Option "Monitor-CRT2" "Monitor1" EndSection Section "Monitor" Identifier "Monitor0" EndSection Section "Monitor" Identifier "Monitor1" Option "RightOf" "Monitor0" EndSection Section "Screen" Identifier "Screen" Device "Device" Monitor "Monitor0" DefaultDepth 24 SubSection "Display" Depth 24 Modes "1920x1080" Virtual 3840 1080 EndSubSection EndSection
To me, this looks pretty much like the setup recommended on the aforementioned website, however, I will simply get the same image in both monitors. Again, I can call xrandr afterwards to achieve the desired effect.
Any ideas how I can fix my xorg.conf?