[Regression] No sound / Deferred binding [RR] on MSI Prestige 16 AI+ C3MG (Panther Lake SoundWire) after UCM update

[Regression] No sound / Deferred binding [RR] on MSI Prestige 16 AI+ C3MG (Panther Lake SoundWire) after UCM update

[GitHub issues - opened]

alsa-project/alsa-ucm-conf issue #784 was opened from tarabelo:

Hello,

A recent update to the `alsa-ucm-conf` package has introduced a regression on the MSI Prestige 16 AI+ C3MG laptop. The audio subsystem falls back to a deferred state, muting all physical outputs (Speakers and Headphone jack). 

The hardware uses an Intel Panther Lake DSP routing audio over a SoundWire bus (4SDCA topology) to Realtek codecs. The SOF firmware loads correctly and the kernel modules are probed, but ALSA fails to map the endpoints with the latest UCM profiles, leaving the controls locked in a `[RR]` (deferred) state in alsamixer.

Downgrading `alsa-ucm-conf` to the previous version completely restores all audio functionality.

### Hardware / System Information:
* **Vendor:** Micro-Star International Co., Ltd.
* **Product:** Prestige 16 AI+ C3MG
* **Board:** MS-2622
* **OS:** Ubuntu 26.04
* **Kernel:** 7.0.0-22-generic
* **DSP:** Intel Panther Lake Smart Sound Technology (SST)
* **Codecs (via SoundWire):** * Realtek ALC1320 (Amps) - mfg_id 0x025d part_id 0x1320
  * Realtek ALC713 (Jack) - mfg_id 0x025d part_id 0x0713

### Symptoms & Logs:
1. `dmesg` shows SOF loading the topology but ALSA defers the binding:
   `sof_sdw sof_sdw: ASoC: Parent card not yet available, widget card binding deferred`
2. `lsmod` confirms `snd_soc_rt1320_sdw` and `snd_soc_rt712_sdca` are loaded.
3. `alsamixer` shows the `sof-soundwire` card, but `Speaker` and `Headphone` elements are locked in `[RR]`.

### Steps to Reproduce:
1. Boot with the latest `alsa-ucm-conf` package on this specific hardware.
2. Check `aplay -l` (only HDMI/DP nodes are visible).
3. Check `alsamixer` (controls deferred).

### Workaround / Proof of Regression:
Reverting `alsa-ucm-conf` from version  1.2.15.3-1ubuntu1.2 to 1.2.15.3-1ubuntu1 and clearing the WirePlumber state (`rm -rf ~/.local/state/wireplumber/`) immediately restores the hardware mapping and functionality.

I can provide the unified diff of the `usr/share/alsa/ucm2` directory between the working and broken versions if needed, or test any proposed patches.

Issue URL     : https://github.com/alsa-project/alsa-ucm-conf/issues/784
Repository URL: https://github.com/alsa-project/alsa-ucm-conf