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ALSA+Pulseaudio have always been difficult with USB Sound. In order to
make it work under the best of circumstances, one would have to edit
/etc/modprobe.d/alsa-base.conf
And comment out any line that said
options snd-usb-audio index=-2
Without commenting that out, PulseAudio cannot detect the card.
Now, Ubuntu 22.04 LTS worked for a while with that change. Until
Roughly the last week of September, 2022. A normal update got pushed
which disabled my sound card.
Alsa-lib version: 1.2.6.1
In /var/log/syslog:
Oct 02 14:33:56 patchwork alsactl[1000]: alsa-lib
main.c:1412:(snd_use_case_mgr_open) error: failed to import hw:1 use
case configuration -2
After two weeks of effort, and attempts to roll back to an earlier
version of 22.04 LTS, I scrubbed the root partition and reverted to
20.04 LTS which works right.
Samples of output from my exercise can be found here:
https://ubuntuforums.org/showthread.php?t=2479484
Again, Xubuntu 22.04 LTS worked (after the alsa-base.conf edit) fine,
Until the end of September update.
The above thread on ubuntuforums.org has samples of lsusb, syslog,
output from various ALSA utilities and PulseAudio utilities, brands and
models of USB sound DACs tried, alsa-version output, and so on.
If you need me to, I can build a throwaway system to get you any further
information you want, but I'd rather not scrub a fully configured root
partition *again* to go through this effort.
linuxquestions.org showed that a search on "failed to open hw:1 use case
configuration" or subsets of that phrase will show this bug.
The tip of the ALSA development chain release notes for a while back
shows no effort put forward to fixing this problem. What works is Alsa-
lib version 1.2.2.
** Affects: alsa-lib (Ubuntu)
Importance: Undecided
Status: New
** Tags: bot-comment
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22.04 LTS: alsa-library + PulseAudio won't detect my USB sound card
https://bugs.launchpad.net/bugs/1992497
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