I'm using a GeForce GT 620 (which is dual-link compatable) and a DVI-I dual-link splitter to try to have a desktop extended onto two monitors.
At the moment when I plug in the monitors, only the monitor on the female VGA marked "1" gets a signal, and the other screen gets nothing and only one screen is detected by nvidia-settings.
After reading around, I have realised that my graphics card probably comes with dual-link disabled by default, and I can enable it by adding an "AllowDualLinkModes" option to my xorg.conf.
This is the current state of my xorg.conf
Section "Device" Identifier "Default Device" Option "NoLogo" "True" EndSection
Where do I put the line about AllowDualLinkModes? Do I create a new Section? Have I misunderstood?