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