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    Please do not post a support request without first reading and following the advice in https://retropie.org.uk/forum/topic/3/read-this-first

    Has cloning the output from HDMI0 output to HDMI1 on Pi4 been implemented yet?

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    pi 4 hdmi
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    • V
      VictimRLSH
      last edited by

      I remember seeing threads where people were trying to get the same output to go to both HDMI0 and HDMI1 on the Pi4 and not being able to. Has this been figured out yet? I'd like to be able to plug an external HDMI cable into my portable Pi4 build and have it play on the TV as well, much like the Nintendo Switch does.

      System Config: Retropie 4.4 with full desktop, RPi 3B, 256gb SD, 5v 2.1A 5,200 mAH USB battery. EasyMSX controller mounted with Pimoroni Hyperpixel 4 (non touch). Also running 4.6 on a 4gb Pi 4 serving as my primary desktop computer now.

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      • mituM
        mitu Global Moderator
        last edited by

        I don't think it's implemented in the GPU driver and there's no provision in RetroPie for dual/mirrored displays. However, if mirroring is all you need, a HDMI splitter should work.

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        • V
          VictimRLSH
          last edited by

          My problem with that solution is the available HDMI splitters are all much too large. Adding a HDMI out port to the case will take a lot less space. I'm using these with 20cm ribbon cables inside the casing and they are quite small.

          https://www.adafruit.com/product/3556

          System Config: Retropie 4.4 with full desktop, RPi 3B, 256gb SD, 5v 2.1A 5,200 mAH USB battery. EasyMSX controller mounted with Pimoroni Hyperpixel 4 (non touch). Also running 4.6 on a 4gb Pi 4 serving as my primary desktop computer now.

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