Hi all,
I wonder if it is possible to configure xorg to work with three monitors this way:

Monitor1 and Monitor2 in xinerama mode
Monitor3 showing the same picture as Monitor 1 does.

This would be great: I work with two monitors in xinerama mode. The third monitor is placed towards people that are sitting in front of me. If we discuss something on screen, they can comfortable look on "their" Monitor3, while I keep sitting where I am and look on Monitor1. ;-)

But I fear, that this configuration is not possible. As far as I understood, I can only do xinerama with all Monitors, or no Xinerama at all. Does anyone know?

Thanks for any hint,
Clemente

With two monitors in xinerama, I've had a partial overlap (by accident) by specifying the position of the second monitor in absolute coordinates that happened to be inside the first. Anything in the overlap area appeared on both monitors.

It sounds like that it what you want: All three monitors together in xinerama, but monitor3 set with coordinates that make it duplicate monitor1.

If monitors 1 and 3 are on the same card, there is probably a lower overhead way to get the same effect using something specific to the driver for that card to merge them, making them look like one monitor to xinerama.