alsa-project/alsa-ucm-conf issue #619 was edited 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