Opi 5 Max, no HDMI sound

Troubleshooting
5

For me it works OOTB with plain ALSA. Of course one needs to take care to select the correct HDMI port:

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rockchiphdmi0 is the one on the outer side, labeled with “TX1”, rockchiphdmi1 is the one next to the USB-C power port, labelled “TX2”.