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No audio on ASUS Zenbook S14 UX5406AA (Panther Lake): sof_sdw fails to create DAI links for cs35l56 #5721

@alsojodan

Description

@alsojodan

I have no audio output (aside from Bluetooth) on my ASUS Zenbook S14
UX5406AA with Intel Core Ultra 9 386H (Panther Lake), running
Ubuntu 26.04 LTS Beta with kernel 7.0.0-10-generic.

All the audio hardware appears to enumerate correctly over SoundWire:

  • cs42l43 codec on link 3 (probed, devid 0x042a43 rev a1)
  • 4x cs35l56 SmartAmp on links 1+2 (all probed, fw 3.4.4)
  • rt722 on link 3
  • SOF firmware boots successfully (v2.13.0.1)

However, when the topology file loads
(sof-ptl-cs42l43-agg-l3-cs35l56-l2.tplg), it fails:

sof-audio-pci-intel-ptl 0000:00:1f.3: Topology: ABI 3:29:1 Kernel ABI 3:23:1
 sof-audio-pci-intel-ptl 0000:00:1f.3: error: can't find BE for DAI alh-copier.Playback-SmartAmp.1
 sof-audio-pci-intel-ptl 0000:00:1f.3: tplg sof-ptl-cs42l43-agg-l3-cs35l56-l2.tplg component load failed -22
 sof_sdw sof_sdw: probe with driver sof_sdw failed with error -22

cat /proc/asound/cards shows: --- no soundcards ---

I'm not sure whether this is caused by the topology ABI mismatch
(3:29 vs 3:23) or by the sof_sdw machine driver missing DAI link
definitions for this Panther Lake codec configuration. I tried
downgrading SOF firmware to v2.13 and v2.12 releases but all
available PTL topology files have ABI 3:29:1, so I couldn't test
with a matching ABI.

SoundWire devices visible:

sdw:0:1:01fa:3556:01:2  (cs35l56)
 sdw:0:1:01fa:3556:01:3  (cs35l56)
 sdw:0:2:01fa:3556:01:0  (cs35l56)
 sdw:0:2:01fa:3556:01:1  (cs35l56)
 sdw:0:3:01fa:4243:01    (cs42l43)
 sdw:0:3:025d:0722:01    (rt722)

System info:
Laptop: ASUS Zenbook S14 UX5406AA
CPU: Intel Core Ultra 9 386H (Panther Lake)
OS: Ubuntu 26.04 LTS Beta
Kernel: 7.0.0-10-generic
firmware-sof-signed: 2025.12.2-1
BIOS: UX5406AA.300 12/18/2025
Hardware probe: https://linux-hardware.org/?probe=34cbba0446

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