[alin23]

Lunar (https://lunar.fyi) supports up to 3 hotkeys to switch input using DDC.

Also the functionality is completely free, the Pro license isn’t needed if you only switch inputs and occasionally adjust brightness or volume.

This might be a more comfortable solution if your monitor allows input switching through DDC.

https://static.lunar.fyi/img/input-key/1920_input-key.png

[yalok]

Lunar worked great for me on MacBook Pro 2020 (2 monitors, one connected over USB-C to USB-C cable, another one over USB-C to DisplayPort), but doesn’t work on for the same monitors connected to MacPro via 2 HDMI cables…

Any idea why?

[alin23]

The HDMI port on most recent Mac devices uses a converter chip inside to convert the signal to DisplayPort internally. That chip has DDC/CI blocked in its firmware and there's no way to enable it.