Input source not supported by the display?

[Jason-WT]

When I use the input source feature, it doesn't work for me. Do I use in a wrong way?

[waydabber]

Hi - support really depends on the Monitor. It might be that the display is not supporting this particular DDC command. Also, make sure that you are using USB-C to connect your display as the HDMI port of recent macs do not pass DDC commands.

You can try the command line tool m1ddc to double check whether input control works.

https://github.com/waydabber/m1ddc