In my previous blog post I described how I used pipewire to add a bluetooth dongle to the audio outputs of my computer.
Unfortunately activating pipewire had the result of it taking control of all the sound interfaces on my computer. This caused a problem with a line-in port which I use for recording audio at scheduled times. It turns out that now and then pipewire will reset the port for maximum gain, wrecking the recording.
I searched for how to exclude this port from pipewire's influence and this was the best answer. I discovered the PCI bus id of the sound card (actually onboard sound device) in question and wrote an override script just like the one described with my card's id. Unfortunately the whole device has to be disabled, not just the line-in port, but that's ok for me. I still have an HDMI port which I can connect to my amplifier instead of using the analog line-out port. So thanks to the author of that ZenLinux blog for the insight. It's a pity such a simple task has to be so complicated, maybe future wireplumber developments will make this simpler.
