alsa-ucm-conf update from 1.2.12 to 1.2.13 causes HDMI/DsiplayPort outputs to disappear

[mwsltn]

Basic Info:
Linux Distro: Arch
Kernel Version: 6.12.1

I have very reliably been using a USB-C connected external monitor that has internal speakers represented by the output device:

HDMI / DisplayPort 1

After running a package update this AM all the HDMI/DisplayPort outputs disappeared. First I downgraded the kernel which didn't help, then checked the pacman logs to see what else had changed and the list included the following:

[2024-11-26T05:07:01-0600] [ALPM] upgraded alsa-ucm-conf (1.2.12-1 -> 1.2.13-1)
[2024-11-26T05:07:01-0600] [ALPM] upgraded alsa-lib (1.2.12-1 -> 1.2.13-1)
[2024-11-26T05:07:01-0600] [ALPM] upgraded alsa-utils (1.2.12-1 -> 1.2.13-1)

So I downgrade:

[2024-11-26T06:51:22-0600] [PACMAN] Running 'pacman -U file:///var/cache/pacman/pkg/alsa-ucm-conf-1.2.12-1-any.pkg.tar.zst file:///var/cache/pacman/pkg/alsa-lib-1.2.12-1-x86_64.pkg.tar.zst file:///var/cache/pacman/pkg/alsa-utils-1.2.12-1-x86_64.pkg.tar.zst'
[2024-11-26T06:51:24-0600] [ALPM] downgraded alsa-ucm-conf (1.2.13-1 -> 1.2.12-1)
[2024-11-26T06:51:24-0600] [ALPM] downgraded alsa-lib (1.2.13-1 -> 1.2.12-1)
[2024-11-26T06:51:24-0600] [ALPM] downgraded alsa-utils (1.2.13-1 -> 1.2.12-1)

Problem fixed.

Please let me know if I can provide any other info.

Originally I had opened an issue on the alsa-lib project and others are reporting the same:

alsa-project/alsa-lib#423

[perexg]

Dup of #472 . Fix is already available.