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I want to set up a multi-monitor configuration where two "landscape" oriented monitors one above the other and two "portrait" oriented monitors one right of the other combine into a single large screen.

I'm trying to create a xorg.conf file that would provide a single X screen for multiple (four) monitors attached to several (two) videocards (NVidia) on the same machine (Ubuntu 11.10).

I stumbled upon a xorg.conf manual that states that the Screen section is the binding of a Monitor and a Device. I don't understand how to provide the idea that one Screen must be composed of several Monitors.

I don't want to use Xinerama or TwinView since it don't meet my requirements for hardware acceleration. I used nvidia-settings but it doesn't honor the rotation settings.

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2 Answers

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You can use the Screen to define the size of the total desktop to be displayed by the various monitors. It can point to one of the three monitors, each in its own section. The options in the additional monitors describe their relative positions.

Although xrandr isn't useful to you as a solution, it can be useful to try various resolutions and positions. Once you have it configured the way you want you can describe the configuration in xorg.conf and restart X. You may find a useful example here.

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Have you tried with RandR (xrandr)?

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Can you include how to actually do it? – Michael Mrozek♦ Jan 20 '12 at 22:26
Unfortunately, nvidia-settings does NOT (sic!) include RandR control in their GUI configuration. I needed to produce a bulk xorg.conf with Option "RandRRotation" "yes" to make it active. Once activated, a control line in nvidia-settings GUI appeared allowing one of the Screens to be rotated. However, the Nvidia's utility itself doesn't honor it's own rotation settings, displaying all the monitors in the monitor layout tab in non-rotated form. Also, RandR rotation is not applied until login, which is inacceptable. – mbaitoff Jan 22 '12 at 13:56
@MichaelMrozek: Probably my comment above answers (at least partly) to your question. – mbaitoff Jan 22 '12 at 19:01

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