Behringer UMC404HD volume low, "cannot load mixer controls: No such file or directory", and erroneously remapped channels

[GitHub issues - opened <github@alsa-project.org>]

alsa-project/alsa-ucm-conf issue #564 was opened from mikelpr:

alright so this is a weird one: I've got a fedora install and two openSUSE installs, one older but dist upgraded to today and a newer one, also dist upgraded to today, and the fedora is updated too.

now, on the fedora install and the newer openSUSE install the volume on my UMC404HD does not reach what is 100% on the older suse install and on Windows. it's more like 50%. I've tried using alsamixer but it fails when selecting the soundcard with `cannot load mixer controls: No such file or directory`. possibly noteworthy is that I share home dir on the suse installs so it's not user config. I also did a diff on /etc between both installs and could find nothing that seemed out of the ordinary.

also, at some point an update was pushed that remapped channels from FL FR RL RR to Line A and Line B, two channels each, and on the Direct profile to FL FC FR LFE. I've got no strong opinions on the Line A/B split on the default profile but definitely FL FC FR LFE is wrong for this card.

please lmk what data to gather

Issue URL     : https://github.com/alsa-project/alsa-ucm-conf/issues/564
Repository URL: https://github.com/alsa-project/alsa-ucm-conf