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I plan to make a presentation with a live demo using my wide screen Ubuntu 12.10 Laptop and a projector. My plan is to connect the projector as a second (small) display and put my slides and live-demo there. It would be convenient, if I could see the projector display on my laptop LCD screen within a window (no zoom or stretch needed). So my question is:

How can I see selected part of a screen within a window?

Thank you for your suggestions!

PS Other possibilities are

  • typing on laptop and looking on the projector screen and not at the audience
  • Cloning laptop display to the projector display: zooming/stretching wide screen to a small projector screen and also being unable to put some private (like timer) information on the laptop screen.

Original on Unix & Linux: https://unix.stackexchange.com/q/97005/49672

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Hier ist a repost of the answer from Unix&Linux from jofel:

(Please, go to the original answer and give +1 there, if you like it)


You can achieve this using the xrandr extension. Read this wiki page and/or this article for more information.

Make sure that the virtual desktop is not greater than your laptop screen. With the --pos option of xrandr you can then mirror parts of your screen to the projector, e.g. for a 1600x900 laptop screen and a 1024x768 projector at position 100,100:

xrandr --fb 1600x900 --output VGA --mode 1024x768 --pos 100x100

For a dual-head presentation, you can also use the following tools (depending on the format of the presentation you uses):

  • pdfpc

  • pympress

  • LibreOffice Impress (perhaps also OpenOffice Impress)

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