Workaround: Comment out the following line:
ATTRS{idVendor}=="08bb", ATTRS{idProduct}=="2902",
ENV{ACP_PROFILE_SET}="behringer-umc22.conf"
...wherever it appears in /lib/udev/rules.d. For me this is in
90-{pipewire-alsa,pulseaudio}.rules.
I don't understand why this workaround helps. I found it here:
https://www.reddit.com/r/linuxaudio/comments/qerbqa/suddenly_cant_select_input_of_behringer_umc22/
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https://bugs.launchpad.net/bugs/1959527
Title:
Behringer UMC22 lost capture support
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