My current audio stack is wireplumber, pipewire, pipewire-pulse, alsa. I had three sound devices on my machine, a USB microphone, a USB webcam, and my desktop's integrated sound ports, and an HDMI port.
Today, I plugged a headphone set into the front I/O panel of my desktop and my sound card disappeared as pulse audio sink. It no longer appears as a sink in pavucontrol. I have restarted all the appropriate services and even the system several times. The audio card never returns. Yes, I have unplugged the headphones. Wireplumber is currently trying to play audio out of my USB mic.
alsamixeris able to see all the audio devices although I can't enable it.pactl list cardscan see all the audio cardspactl list sinksonly lists my USB microphone.