Peter, run "xdpyinfo" on the command line. It tells you the dimensions of your screen.
If you have one large screen with the sum of the width of your monitors and the maximum of both height
then you have Xinerama enabled.
You can also check if you can resize/move a window to be visible on both screens.
Peter, run "xdpyinfo" on the command line. It tells you the dimensions of your screen.
If you have one large screen with the sum of the width of your monitors and the maximum of both height
then you have Xinerama enabled.
You can also check if you can resize/move a window to be visible on both screens.