I have 2 video cards installed and configured xorg.conf to output onto both monitors with Option Xinerama 1 but rather than extending my display, it is simply cloning the displays.I'm using KDM as a display manager, which recognises that there are 2 monitors, but no matter what I do, it seems to only clone the displaysHere is the server layout and flags from xorg.conf:Section ServerLayout    Identifier     X.org Configured    Screen      0  Screen0 0 0    Screen      1  Screen1 RightOf Screen0    InputDevice    Mouse0 CorePointer    InputDevice    Keyboard0 CoreKeyboardEndSectionSection ServerFlags    Option      Xinerama 1 EndSection
Multiple video cards on Xorg on Debian 7.4
debian;xorg;multi monitor