Dennis Lee Bieber  writes:

>  https://en.wikipedia.org/wiki/HDMI look at the pin-out... Pin 18 is
> intended to provide power for "active cables"
> https://www.hdmi.org/spec/hdmi2_1 https://www.hdmi.org/spec21sub/cablepower

Cable power yes, but it's also very convenient that an HDMI port can
power an HDMI to VGA converter. There are so many old projectors in so
many meeting rooms with VGA cables even today. The minimum current to
provide through pin 18 is only 55 mA though. Not enough to run a Pi.

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