[BUG] No audio on ASUS Zenbook Duo UX8407AA (2026) (Panther Lake Intel X9 388H) — regression between 7.0.11 and 7.1.2, RT722 SoundWire probe failure

[Manish2414]

Pre-flight checklist

• I have searched existing issues and this is not a duplicate.
• I have read the Contributing Guidelines.
• I have verified the issue is reproducible with the latest available CachyOS kernel.
• I have tried to reproduce the issue on Arch Linux's linux kernel.

Upstream / vanilla kernel check

I have not tested with a vanilla/upstream kernel

Kernel variant

linux-cachyos (EEVDF, Clang)

System information (cachyos-bugreport.sh)

https://paste.cachyos.org/p/7fa9e4d.log

Manual system information (if cachyos-bugreport.sh is unavailable)

Kernel version: 7.1.2-3-cachyos (bug reproduces here); 7.0.11-1-cachyos (works)
CPU: Intel Core Ultra X9 388H (Panther Lake)
GPU: Intel Arc B390 (Xe driver) — not relevant to this bug
Architecture: x86-64-v3
Active SCX scheduler: none / default

Bug description

No audio output on the ASUS Zenbook Duo UX8407AA. PipeWire only shows a "Dummy
Output" sink — no real sound card is registered. This is caused by the sof_sdw
machine driver failing to probe due to a duplicate sysfs widget name collision
on the RT722 SoundWire codec.

Steps to reproduce

1. Boot ASUS Zenbook Duo UX8407AA on linux-cachyos 7.1.2-3 (or likely any
   7.1.x build).
2. Check audio: wpctl status
3. Only "Dummy Output" appears, no real sink.

Expected behavior

RT722 SoundWire codec should register as a working sound card with speaker/mic
output, as it does on linux-cachyos 7.0.11-1 on the same hardware.

Actual behavior

sof_sdw machine driver probe fails. PipeWire has no real audio device, only
Dummy Output.

Logs / stack traces

<details>
<summary>dmesg (linux-cachyos 7.1.2-3, broken)</summary>


sof-audio-pci-intel-ptl 0000:00:1f.3: No SoundWire machine driver found for the ACPI-reported configuration:
sof-audio-pci-intel-ptl 0000:00:1f.3: link 2 mfg_id 0x01fa part_id 0x3556 version 0x3
sof-audio-pci-intel-ptl 0000:00:1f.3: link 3 mfg_id 0x01fa part_id 0x4243 version 0x3
sof-audio-pci-intel-ptl 0000:00:1f.3: link 3 mfg_id 0x025d part_id 0x0722 version 0x3
sof-audio-pci-intel-ptl 0000:00:1f.3: Use SoundWire default machine driver with function topologies
sysfs: cannot create duplicate filename '/devices/pci0000:00/0000:00:1f.3/sof_sdw/SDW3-Playback-SimpleJack'
sof_sdw sof_sdw: probe with driver sof_sdw failed with error -12


</details>

Additional system information

ASUS Zenbook Duo UX8407AA, BIOS UX8407AA.308.
sof-firmware 2025.12.2-1 (unchanged across both kernel tests, and confirmed via
pacman -Si that no newer version is available in any configured repo).
PipeWire 1.6.7, KDE Plasma (Wayland).
RAM: 32 GiB.
Workaround currently in use: booting linux-cachyos 7.0.11-1 instead of the
default kernel.
Happy to provide a full inxi/dmesg dump or test patches if useful.