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I replaced OSX with Linux on my Macbook Pro. When I had OSX in it, I could connect an external monitor and it would be automatically detected and used. When I disconnected it, everything would move to the laptop monitor.

This doesn't happen in Ubuntu. How can we fix this people?

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You can add resolution modes manualy in xrandr. However if you use latest ubuntu you should be able to do it in GUI way.

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… so how does one do this in a GUI way? – slhck Jan 25 '12 at 11:24

See my answer here. It involves installing pygtk and running this script.

I'm not an Ubuntu user - there's probably a way to do this without external tools, but I don't know what it is.

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