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How can I reset dual display to one screen from command line and set old second screen as main display? (12.04 + nvidia)

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see this question on a similar topic, and the docs for NvidiaMultiMonitors and DynamicMultiMonitor. –  Eliran Malka Oct 25 '12 at 11:57
    
you'd probably want to check out the nvidia-xconfig man page as well. it's all there. –  Eliran Malka Oct 25 '12 at 12:00
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I would recommend installing disper, a command line display manager.

Then you can do disper -S to make secondary only, or disper -e -t left to extend to the left for example.

Install via the software center

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