Comment 1 for bug 137234

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James Henstridge (jamesh) wrote : Re: [gutsy] Second display not enabled with "intel" video driver

You should be able to enable it by running the following command in the terminal:
    xrandr --output VGA --auto

If a monitor is attached, it should enable it. If one isn't attached, it should disable it again. I guess what is needed here is some daemon to perform the appropriate xrandr commands in response to the key presses.