How can I switch the sound to headphones automatically when I plug them in?

[Alan_Pearce]

@James3

I am not sure this is particularly helpful, but my FW16 with Ubuntu 24.04 on it auto-switches from speakers to headphones when I plug them in. They are USB headphones.
So, I can tell you what you want is definitely possible because it works here, but I did not have to configure anything to get it to work, it did it automatically.

On my Fedora 40 I also get autoswitching using bluetooth headphones. However I think you will fine that because your headphones are plugged in there is no way for the headphone module to inform the rest of the system that it now has headphones plugged in as it is an already plugged in USB device. I think you will need to manually switch them.