Missing UCM matcher for ASUS Zenbook S 14 UX5406SA (cs42l43/cs35l56, Lunar Lake)

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

alsa-project/alsa-ucm-conf issue #619 was opened from sjolo312:

This is not a kernel bug but a missing UCM matcher.

Result:
With the matcher below and the latest upstream alsa-ucm-conf files, speakers and microphone work on the ASUS Zenbook S 14 UX5406SA (Lunar Lake, cs42l43 + cs35l56).

Tested on:
- Ubuntu 25.10 beta (up-to-date live session)
- alsa-ucm-conf: upstream master from GitHub (as of 2025-09-26)

CardLongName:
ASUSTeKCOMPUTERINC.-ASUSZenbookS14UX5406SA_UX5406SA-1.0-UX5406SA

Root cause:
Upstream master does not contain a matcher for this CardLongName, so no UCM profile is loaded (-> “Dummy Output”).
Adding the matcher below ensures the existing sof-soundwire profile (which already includes cs42l43/cs35l56 routes) is loaded, and audio works.

Proposed new file:
Path: ucm2/conf.d/sof-soundwire/ASUS-Zenbook-S14-UX5406SA.conf

# ASUS Zenbook S 14 UX5406SA (Lunar Lake)
SectionDefaults."sof-soundwire" {
    Condition {
        Type Regex
        CardLongName "ASUSTeKCOMPUTERINC.-ASUSZenbookS14UX5406SA.*"
    }
    Include.conf "sof-soundwire/sof-soundwire.conf"
}

Verification (files actually loaded):
Gathered with:
strace -f -e trace=%file -o /tmp/ucm.trace \
  alsaucm -c sof-soundwire list _verbs >/dev/null 2>&1
grep -oE '/usr/share/alsa/ucm2/[^"]+' /tmp/ucm.trace | sort -u

Resulting files included:
/usr/share/alsa/ucm2/Intel/sof-hda-dsp/dsp.conf
/usr/share/alsa/ucm2/blobs/sof/product_configs/ASUSTeK COMPUTER INC./ASUS Zenbook S 14 UX5406SA_UX5406SA.conf
/usr/share/alsa/ucm2/blobs/sof/user_configs/ASUSTeK COMPUTER INC./ASUS Zenbook S 14 UX5406SA_UX5406SA.conf
/usr/share/alsa/ucm2/codecs/cs35l56/init.conf
/usr/share/alsa/ucm2/codecs/cs42l43/init.conf
/usr/share/alsa/ucm2/codecs/hda/hdmi.conf
/usr/share/alsa/ucm2/common/ctl/led.conf
/usr/share/alsa/ucm2/common/pcm/hdmi.conf
/usr/share/alsa/ucm2/conf.d/sof-soundwire/ASUSTeKCOMPUTERINC.-ASUSZenbookS14UX5406SA_UX5406SA-1.0-UX5406SA.conf
/usr/share/alsa/ucm2/conf.d/sof-soundwire/sof-soundwire.conf
/usr/share/alsa/ucm2/lib/card-init.conf
/usr/share/alsa/ucm2/lib/ctl-remap.conf
/usr/share/alsa/ucm2/lib/generic.conf
/usr/share/alsa/ucm2/sof-soundwire/Hdmi.conf
/usr/share/alsa/ucm2/sof-soundwire/HiFi.conf
/usr/share/alsa/ucm2/sof-soundwire/cs35l56.conf
/usr/share/alsa/ucm2/sof-soundwire/cs42l43.conf
/usr/share/alsa/ucm2/sof-soundwire/dmic.conf
/usr/share/alsa/ucm2/ucm.conf

Request:
Please add this matcher to alsa-ucm-conf upstream, so that the ASUS Zenbook S 14 UX5406SA works out-of-the-box on all Linux distributions.

Happy to test any proposed patch or provide further logs if needed.

Issue URL     : https://github.com/alsa-project/alsa-ucm-conf/issues/619
Repository URL: https://github.com/alsa-project/alsa-ucm-conf