I have an additional monitor at home and at work, but they have different resolutions. That was no problem for Ubuntu. I recently set up a new laptop with Xubuntu, and now the second monitor is always mirrored. I solved it by making a few bash scripts with xrandr commands to set the correct monitor settings. So the first thing I do is running home_screen.sh or office_screen.sh after I boot my system. I also have laptop_only_screen.sh and beamer.sh. It works, but still... Can someone explain the different behaviors of Ubuntu and Xubuntu? By the way, my old laptop had a VGA port, the new one has HDMI. Could that be an explanation for the different behavior instead of switching to Xubuntu?


Go to Settings > Display and check the box that says "Configure new displays when connected". Now when you plug a new monitor in, it should pop up a dialog box for selecting the display mode. If this does not work, check to make sure that you are using the best driver for your graphics card. (Settings > Additional Drivers)

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    That dialog box only pops up when you connect the monitor after system startup. And I switched to the alternative drivers (fglrx-updates, proprietary) already... – Jan van Veldhuizen Apr 9 '16 at 7:11

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