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I'm posting this because it took me two hours to figure out how to fix this issue, and hopefully this helps someone else out.
I was using pulseaudio on Sway (initially I tried installing pipewire, pipewire-pulse, and pipewire-media-session, but I uninstalled all of these to simplify the debugging process; they're now re-installed and work fine). I wasn't getting any sound cards when trying pacmd list-cards:
0 cards found.Pulseaudio produced a dummy output and that was it.
I looked at journalctl -p 3:
sof-audio-pci-intel-tgl error: sof firmware file is missing, you might need to download it
error: failed to load DSP firmware -2
error: sof_probe_work failled err: -2The relevant packages I needed to download were sof-firmware, alsa-ucm-conf AND sof-tools. I'm fairly certain it was the latter that solved this issue.
# pacman -S sof-firmware sof-tools alsa-ucm-confRelevant posts:
[SOLVED] No Audio on Dell XPS 13 (9310): https://bbs.archlinux.org/viewtopic.php?id=260139
Sound card not detected - Ubuntu 20.04 - sof-audio-pci https://askubuntu.com/a/1313726
The second link details a solution that you might try if installing these packages and rebooting doesn't work.
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