[astura]

Listening for function key presses, I would imagine.

Every laptop I've ever had allowed volume control with function keys.

Disclaimer: it's been over a decade since I've done applications development and I've never done driver development.

[radarsat1]

Ah yeah that makes sense... sort of. I would have expected specific volume commands to come through from another layer, not for the audio driver itself to be directly listening to the keyboard. But I guess that's why it's just debugging code.