[Stable Update] 2022-07-18 - Kernels, Pipewire, Mesa, Xorg, XWayland, Gnome, KDE Gear, Plamo

solution for no sound from USB DAC (may or may not be specific to the MOTU M2)…

downgrade alsa-ucm-conf to 1.2.7.1-1 - this may be enough by itself to restore sound, but if not…

downgrade alsa-lib to 1.2.7.1-1 version

in my case power cycling the DAC was enough to restore sound (no reboot)

references…