I have two audio devices on my Ubuntu 20.04 machine: Built-in Audio and a USB sound device, and I only want to use the USB device; I don't need the Built-in Audio at all, and I'd like to disable it (because then I never have to worry about selecting a sound device in video conferencing apps and the like). I can disable the Built-in Audio device in PulseAudio Volume Control (pavucontrol) by setting "Built-in Audio" to "off", and I can also do this same action from the command line with pactl set-card-profile alsa_card.pci-0000_00_03.0 off and that all works. However, if I lock the screen and then unlock it again, that card gets re-enabled! How can I set it to off so that it stays off?
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