alsa-lib 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.

[edwloef]

I am also experiencind this issue, under the same conditions as OP. Additionally, my laptop speaker and headphones outputs, which used to be separate, are now both shown as "alsa_output.pci-0000_00_1f.3-platform-skl_hda_dsp_generic.stereo-fallback"

[gthomassen]

Same issue here as well - Arch Linux with alsa-ucm-conf 1.2.12 works fine with audio over USB-C/DisplayPort, but the audio device disappears with alsa-ucm-conf 1.2.13.

The issue is alsa-ucm-conf, not alsa-lib.

[mwsltn]

Copy that. I'll re-file the bug over there. I had assumed the versions needed to be pinned across all 3 so I didn't try to tease it out further.

[perexg]

Dup of alsa-project/alsa-ucm-conf#472 . Fix is already available.