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So... I have two monitors on my Ubuntu machine. And every time I launch some Windows OpenGL application under Wine it turns off the second monitor. And leaves it turned off when the application exits. I wonder, is there a shell command which will instantly turn the second monitor on?

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    Try the xrandr command?
    – Graeme
    Commented Apr 15, 2014 at 13:13
  • Any concrete samples? Commented Apr 15, 2014 at 14:02
  • Depends a lot on what you have/what you want. I use this on my laptop - xrandr --output HDMI1 --auto --same-as LVDS1. You can have --left-of, --right-of etc.
    – Graeme
    Commented Apr 15, 2014 at 14:06
  • Ok, I'l try to read man Commented Apr 15, 2014 at 14:07
  • @Graeme you can answer question,and I will accept your answer. I read man page and created a link on my desktop which does what I want. Commented Apr 15, 2014 at 14:16

2 Answers 2

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The xrandr command is the one you are looking for. An example usage is:

xrandr --output HDMI1 --auto --same-as LVDS1

You can have --left-of, --right-of. Run xrandr on its own to see the different outputs that are available.

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    I'll add that to find out names of outputs one can run xrandr --current Commented Apr 15, 2014 at 15:07
  • @AleksandrKravets, shouldn't be any different than xrandr on its own in most cases. The man page says that this avoids looking for any hardware changes, so I would avoid this unless I have a specific reason to use it.
    – Graeme
    Commented Apr 15, 2014 at 15:12
  • You're right, I just didn't try it that way :) Commented Apr 15, 2014 at 15:19
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Use xrandr command without args for view your output names and the supported resolutions.

Once you have this informations, you can setup a screen like this (this is an example, there is a lot of others options):

**xrandr --output <output> --mode <resolution> --right-of/--left-of <output>**

You can also just reactivate your screen with:

**xrandr --output <output> --auto**
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    Sorry, there's no such thing as --on option. But there's --auto. Commented Apr 15, 2014 at 14:14

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