Comment by jonah-archive

A long time ago I used one of these HDMI-CEC-to-USB/serial bridges: https://web.archive.org/web/20110219131237/http://rainshadow...

(I'd gotten a large LG monitor instead of a flatscreen tv, and it didn't talk HDMI-CEC but it had a serial-over-TRRS control interface, so I listened for messages on the bus and my media PC translated and relayed them to the monitor.)