Ubuntu – How to set-up three monitors with two graphics cards (3d acceleration enabled) in Unity

11.0411.10multiple-monitorsunity

I have looked at:

  1. How does /will Unity handle multiple monitors? -> only two monitors with twinview
  2. How do I get three monitors working? -> each monitor uses a separate x screen + xinerama (no 3d acceleration -> no Unity)

My current setup looks like this:

Two monitors in Twinview + one monitor as a separate X screen (it is not a problem that I cannot move windows from that monitor to the other two, I used to work like this on Ubuntu 10.10). The problem with this is, that I am unable to start applications on the separate X screen and when I manage to open a terminal on there, I am unable to interact with it (no window decoration).

I can still use my setup with the Gnome session (Ubuntu Classic), so I am not urgently looking for an answer, but I would like to know if it can be done and hopefully learn something in the process.

Edit: I should probably mention that I have two nvidia graphics cards in my computer. And that I am happy with the solution that I am currently using with gnome (i. e. TwinView + separate X screen). This won't work with Unity as I don't know of a way to launch applications on the separate X screen.

Best Answer

It's currently quite hard to get even dual monitors working. There are reports of bugs and inability to get a dual monitor working so 3 monitors is going to be a stretch at this point.

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