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I have a laptop connected to external monitor. Everything ok, but sometimes I need to check what's going on on external monitor (because I can't see them), hence two monitor should display the same output for a while. Are there any ways to do so?

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  • It is unclear. Can you just look at the external monitor and check what is going on there?
    – Pilot6
    Sep 15, 2015 at 10:28
  • No I can't. I'm behind of it. Sep 15, 2015 at 10:30
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    @TimurFayzrakhmanov Not the best solution but you could always use something like OBS to live capture your second screen and view it on the OBS window on your laptop. Sep 15, 2015 at 10:31
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    Doesn't the laptop have a function key to switch between built-in and external screen?
    – Jos
    Sep 15, 2015 at 11:04
  • Yes it does, but it have different purpose) so it is not suitable for this situation. Sep 15, 2015 at 11:16

2 Answers 2

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Easy and simple, you can take a screenshot using print screen key. It shows both screens.

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A simple solution if you are using X11 is to take a snapshot of the second display. For example, using xwd and assuming the monitor is display screen 0.1,

xwd -root -display :0.1 | xwud -in /dev/stdin

should show the current screen in a window.

An alternative is to use x11vnc and xvncviewer.

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