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A New Chapter for MagicMirror: The Community Takes the Lead
Read the statement by Michael Teeuw here.

Rpi 4 and two monitors

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  • B Offline
    bhepler Module Developer @NathTheDude
    last edited by Feb 4, 2020, 8:26 PM

    @NathTheDude - I tried that one-pi-two-instances thing a couple years ago. I wasn’t using an RPI but rather a tiny Ubuntu box. My problem was that I couldn’t find a way to guarantee which instance would appear on which monitor at start. They usually both ended up in the same monitor on top of each other.

    You may have more luck than I did. If you do figure it out, please let me know how you did it!

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    • S Offline
      sdetweil @NathTheDude
      last edited by Feb 4, 2020, 8:27 PM

      @NathTheDude said in Rpi 4 and two monitors:

      think I would prefer to have two MM’s installed (one for each monitor), I assume this is ok todo or is the best approach to have the one MM on both screens?

      the answer is yes, … depends on what you want to do…

      to use two MM on the same full width display you will have to modify custom.css on the one to the right
      and make its starting position 1/2 way across the screen

      when MM is on the left, is the desktop a full image, or just the right side of the full image?

      Sam

      How to add modules

      learning how to use browser developers window for css changes

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      • N Offline
        NathTheDude
        last edited by Feb 4, 2020, 8:32 PM

        Hey @sdetweil , I started with stopping MM (pm2 stop all). This then allowed me to use VNC to change the screen settings, as in just rotate the screen’s display.

        The screens are showing as two seperate desktops and from VNC the mouse smoothly goes from one display to the other.

        When MM is started this completly fills the first screen and a raspbian windows desktop is seen on the 2nd screen.

        S 1 Reply Last reply Feb 4, 2020, 8:40 PM Reply Quote 0
        • S Offline
          sdetweil @NathTheDude
          last edited by Feb 4, 2020, 8:40 PM

          @NathTheDude try the raspian, preferences, appracne settings, desktop stretch across

          Sam

          How to add modules

          learning how to use browser developers window for css changes

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          • N Offline
            NathTheDude
            last edited by NathTheDude Feb 4, 2020, 8:47 PM Feb 4, 2020, 8:46 PM

            Thanks @sdetweil , I have just played with those settings again. These seem to only effect the desktop and the desktop background and not the MM site. Always appears on the first screen.

            S 1 Reply Last reply Feb 4, 2020, 8:47 PM Reply Quote 0
            • S Offline
              sdetweil @NathTheDude
              last edited by Feb 4, 2020, 8:47 PM

              @NathTheDude but is the desktop all the way across as a single desktop, or two separate instances?

              Sam

              How to add modules

              learning how to use browser developers window for css changes

              B 1 Reply Last reply Feb 4, 2020, 9:16 PM Reply Quote 0
              • N Offline
                NathTheDude
                last edited by Feb 4, 2020, 8:54 PM

                @sdetweil , it is seen as two separate monitors. There is not a setting to scretch one screen to the other with the settings. The closest is ‘Strectch to cover screen’ but that does not seem to help.

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                • B Offline
                  bhepler Module Developer @sdetweil
                  last edited by Feb 4, 2020, 9:16 PM

                  @sdetweil - I don’t know if that capability is in the Raspi display drivers. It’s always going to see the two monitors as two separate devices with unique desktops. If you click on the Identify button, it should show you a different number on each monitor.

                  The only thing I can think of that would treat two monitors as a single continuous desktop is the AMD Eyefinity tech.

                  S 1 Reply Last reply Feb 4, 2020, 9:19 PM Reply Quote 0
                  • N Offline
                    NathTheDude
                    last edited by Feb 4, 2020, 9:19 PM

                    Thanks @sdetweil and @bhepler , could you point me in the direction of how I would display a seperate instance of MM each monitor? I know this would mean I would need to update/maintain two different MM’s but maybe that is a better option if I want to add various modules?

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                    • S Offline
                      sdetweil @bhepler
                      last edited by Feb 4, 2020, 9:19 PM

                      @bhepler said in Rpi 4 and two monitors:

                      I don’t know if that capability is in the Raspi display drivers. It’s always going to see the two monitors as two separate devices with unique desktops. If you click on the Identify button, it should show you a different number on each monitor.

                      well, that is stupid sh… , in this day and age you should be able to config the thing like u want…

                      I booted ubuntu on my desktop with has two displays and it made one big desktop by default…
                      can’t understand why raspi should be so dumb

                      Sam

                      How to add modules

                      learning how to use browser developers window for css changes

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