[lillecarl]

The protocol runs over the USB cable to your monitor, so whichever monitor has that cable plugged will be able to send the commands.

I'm using this command

sudo virsh start win10;sudo ddcutil -d 1 setvcp 0x60 0x03

To start Windows and change display input to DVI, which is the GPU for my Windows VM.

Changing back can be done either by powering the VM down or running the command

sudo ddcutil -d 1 setvcp 0x60 0x0F