TIL you can use a HDMI port as an I²C interface on Linux http://www.sodface.com/tech/alpine-chromebase-rtc/ #Linux
@60ead002 I think this is related? https://youtu.be/8UbVgUFfN8U
@60ead002 VGA also has I²C. It's used to communicate with the monitor to find out its capabilities, even when it's switched off. https://hackaday.com/2014/06/18/i2c-from-your-vga-port/