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I am running a Debian stable with Cinnamon graphical interface 3.6.7 and my computer is connected to a multimedia projector. I havea an Intel Graphic card.

The projected image is too big and I can't change neither the place of my multimedia projector nor the place of my wall to reduce the size of the projected image.

Thus I would like to find a command line so that the resolution of the projected image is the same but such that a black band is at the border of my screen (see Figures below). I expect then that the projected image will have a smaller size.

Solution (@Ipor Sircer)

xrandr --output HDMI1 --fb 1620x880

Current configuration: Current configuration

Expected configuration Expected configuration

Smilia
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    You may look at xrandr tool to manage you display & resolution etc... – francois P Oct 17 '18 at 19:46
  • What model projector do you have? I have found that you can possible change your settings to reduce the "overscan" as shown here and here. Or do you prefer a command line solution? – kemotep Oct 17 '18 at 20:24
  • I would prefer command line solution but I will have a look to overscan with the projector settings – Smilia Oct 17 '18 at 20:42
  • @Smilia, I would check out the xrandr command with the --transform option listed here if you are set on using command line. You will have to play around with the exact parameters to get what you desire. Again, I would check for "Overscan" or "Screen Fit" or "Aspect Ratio" settings on the projector itself to accomplish your goals. – kemotep Oct 17 '18 at 20:55

1 Answers1

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Use xrandr to detect the default output. Then you can make a black border:

xrandr --output LVDS --set underscan on --set "underscan vborder" 100 --set "underscan hborder" 100

(not working with intel graphic card)

Smilia
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Ipor Sircer
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  • ok thanks I ran this command:

    $ xrandr --output LVDS1 --set underscan on --set "underscan vborder" 100 --set "underscan hborder" 100

     – Smilia Oct 17 '18 at 20:17
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    I get the error: X Error of failed request: BadName (named color or font does not exist) – Smilia Oct 17 '18 at 20:17
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    Major opcode of failed request: 140 (RANDR) Minor opcode of failed request: 11 (RRQueryOutputProperty) Serial number of failed request: 47 Current serial number in output stream: 47 – Smilia Oct 17 '18 at 20:17
  • Which video driver do you use? Not all supports this, only AMD and NVIDIA. – Ipor Sircer Oct 17 '18 at 20:26
  • Oh yeah I have intel ... – Smilia Oct 17 '18 at 20:28
  • Then you can play with various --transform parameters. I have no experience with this. – Ipor Sircer Oct 17 '18 at 20:43
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    It's a related question: https://unix.stackexchange.com/questions/472459/xrandr-problem-trying-to-avoid-broken-display – Ipor Sircer Oct 17 '18 at 20:50