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[Bug 2125284] Re: ASUS Zenbook S14 UX5406SA (Lunar Lake): no internal audio – cs42l43/cs35l56 report missing power supplies (“using dummy regulator”) on Ubuntu 25.10 beta (kernel 6.17)

To: debcrafters-packages@xxxxxxxxxxxxxxxxxxx
From: Daniel Letzeisen <2125284@xxxxxxxxxxxxxxxxxx>
Date: Wed, 24 Sep 2025 03:49:56 -0000
Reply-to: Bug 2125284 <2125284@xxxxxxxxxxxxxxxxxx>
Sender: noreply@xxxxxxxxxxxxx
May be duplicate of bug 2125542

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https://bugs.launchpad.net/bugs/2125284

Title:
  ASUS Zenbook S14 UX5406SA (Lunar Lake): no internal audio –
  cs42l43/cs35l56 report missing power supplies (“using dummy
  regulator”) on Ubuntu 25.10 beta (kernel 6.17)

Status in alsa-driver package in Ubuntu:
  New

Bug description:
  Summary
  On an ASUS Zenbook S14 UX5406SA (Lunar Lake) running Ubuntu 25.10 beta, the internal speakers/mic do not work. SOF topology for this model is present (l23), firmware packages are current, but the cs42l43 codec and cs35l56 amplifiers fail to initialize due to missing power supplies (kernel falls back to “dummy regulator”). Likely a kernel/platform (ACPI/regulator mapping) issue rather than SOF firmware.

  System

  Device: ASUS Zenbook S14 UX5406SA (Lunar Lake)

  Ubuntu: 25.10 beta (Questing)

  Kernel: 6.17.0-4-generic (uname -a: Linux ubuntu 6.17.0-4-generic
  #4-Ubuntu SMP PREEMPT_DYNAMIC Mon Sep 8 16:09:17 UTC 2025 x86_64
  GNU/Linux)

  Firmware/UCm:

  firmware-sof-signed 2025.05.1-1 (installed & candidate)

  alsa-ucm-conf 1.2.12-1ubuntu2

  
  Topology files present (excerpt):
  /lib/firmware/intel/sof-ipc4-tplg/
    sof-lnl-cs42l43-l0-cs35l56-l23-2ch.tplg
    sof-lnl-cs42l43-l0-cs35l56-l23-4ch.tplg
    sof-lnl-cs42l43-l0-cs35l56-l23.tplg

  
  ALSA Card:
  0 [sofsoundwire]: sof-soundwire - sof-soundwire
      ASUSTeKCOMPUTERINC.-ASUSZenbookS14UX5406SA_UX5406SA-1.0-UX5406SA

  
  Observed behavior (dmesg excerpts)

  sof-audio-pci-intel-lnl ...: SoundWire enabled on CannonLake+ platform, using SOF driver
  cs42l43 sdw:0:0:01fa:4243:01: supply vdd-p not found, using dummy regulator
  cs42l43 sdw:0:0:01fa:4243:01: supply vdd-d not found, using dummy regulator
  cs42l43 sdw:0:0:01fa:4243:01: supply vdd-a not found, using dummy regulator
  cs42l43 sdw:0:0:01fa:4243:01: supply vdd-io not found, using dummy regulator
  cs42l43 sdw:0:0:01fa:4243:01: supply vdd-cp not found, using dummy regulator
  ...
  cs35l56 sdw:0:2:01fa:3556:01:0: supply VDD_P not found, using dummy regulator
  cs35l56 sdw:0:2:01fa:3556:01:0: supply VDD_IO not found, using dummy regulator
  cs35l56 sdw:0:2:01fa:3556:01:0: supply VDD_A not found, using dummy regulator
  ...
  cs42l43-codec cs42l43-codec: supply vdd-amp not found, using dummy regulator
  ...
  cs42l43 sdw:0:0:01fa:4243:01: Failed to read IRQ status: -16


  What I expected
  With current firmware-sof-signed and the correct l23 topology present, the codec/amps should get proper regulator supplies via ACPI/platform definitions and initialize, providing working internal speakers/mic.

  What I get
  Only HDMI/DP sinks appear; internal speakers/mic are non-functional (PipeWire shows “Dummy Output”/no sinks). The drivers explicitly warn about missing supplies and fail to attach properly on SoundWire.

  Why I believe this is a kernel/platform issue

  SOF firmware and topology files are present and up-to-date.

  Errors indicate missing regulator supplies (VDD_P, VDD_A, VDD_IO,
  etc.) for cs42l43/cs35l56, which are normally provided via
  ACPI/regulator mappings in the platform layer.

  Fedora reportedly has this model working already; likely their kernel
  carries upstream/backported fixes for Lunar Lake + cs42l43/cs35l56
  regulator/ACPI integration.

  Request
  Please review and pull/backport the upstream fixes that define the required regulators/mappings for ASUS UX5406SA (Lunar Lake) using cs42l43 + cs35l56 on SoundWire. If additional UCM tweaks are needed for the l23 variant, please advise.


  
  Commands used:

  uname -a
  apt policy firmware-sof-signed alsa-ucm-conf
  ls /lib/firmware/intel/sof-ipc4-tplg/ | grep l23
  cat /proc/asound/cards
  dmesg | grep -i -e snd_sof -e soundwire -e cs42l43 -e cs35l56 | tail -n 200



  ubuntu@ubuntu:~$ uname -a
  Linux ubuntu 6.17.0-4-generic #4-Ubuntu SMP PREEMPT_DYNAMIC Mon Sep  8 16:09:17 UTC 2025 x86_64 GNU/Linux
  ubuntu@ubuntu:~$ apt policy firmware-sof-signed alsa-ucm-conf
  firmware-sof-signed:
    Installed: 2025.05.1-1
    Candidate: 2025.05.1-1
    Version table:
   *** 2025.05.1-1 500
          500 cdrom://Ubuntu 25.10 _Questing Quokka_ - Beta amd64 (20250917.2) questing/main amd64 Packages
          500 cdrom://Ubuntu 25.10 _Questing Quokka_ - Beta amd64 (20250917.2) questing/main i386 Packages
          500 http://archive.ubuntu.com/ubuntu questing/main amd64 Packages
          500 http://archive.ubuntu.com/ubuntu questing/main i386 Packages
          100 /var/lib/dpkg/status
  alsa-ucm-conf:
    Installed: 1.2.12-1ubuntu2
    Candidate: 1.2.12-1ubuntu2
    Version table:
   *** 1.2.12-1ubuntu2 500
          500 http://archive.ubuntu.com/ubuntu questing/main amd64 Packages
          500 http://archive.ubuntu.com/ubuntu questing/main i386 Packages
          100 /var/lib/dpkg/status
  ubuntu@ubuntu:~$ ls /lib/firmware/intel/sof-ipc4-tplg/ | grep l23
  sof-adl-cs42l43-l0-cs35l56-l23.tplg
  sof-arl-cs42l43-l0-cs35l56-l23.tplg
  sof-lnl-cs42l43-l0-cs35l56-l23-2ch.tplg
  sof-lnl-cs42l43-l0-cs35l56-l23-4ch.tplg
  sof-lnl-cs42l43-l0-cs35l56-l23.tplg
  sof-lnl-rt711-l0-rt1316-l23-rt714-l1.tplg
  sof-mtl-cs42l43-l0-cs35l56-l23.tplg
  sof-mtl-rt711-l0-rt1316-l23-rt714-l1.tplg
  ubuntu@ubuntu:~$ cat /proc/asound/cards
   0 [sofsoundwire   ]: sof-soundwire - sof-soundwire
                        ASUSTeKCOMPUTERINC.-ASUSZenbookS14UX5406SA_UX5406SA-1.0-UX5406SA
  ubuntu@ubuntu:~$ 

  sudo dmesg | grep -i -e snd_sof -e soundwire -e cs42l43 -e cs35l56 | tail -n 200
  [   10.413856] sof-audio-pci-intel-lnl 0000:00:1f.3: SoundWire enabled on CannonLake+ platform, using SOF driver
  [   11.010122] cs42l43 sdw:0:0:01fa:4243:01: supply vdd-p not found, using dummy regulator
  [   11.010225] cs42l43 sdw:0:0:01fa:4243:01: supply vdd-d not found, using dummy regulator
  [   11.010250] cs42l43 sdw:0:0:01fa:4243:01: supply vdd-a not found, using dummy regulator
  [   11.010263] cs42l43 sdw:0:0:01fa:4243:01: supply vdd-io not found, using dummy regulator
  [   11.010279] cs42l43 sdw:0:0:01fa:4243:01: supply vdd-cp not found, using dummy regulator
  [   11.015735] cs42l43 sdw:0:0:01fa:4243:01: devid: 0x042a43, rev: 0xa1, otp: 0x03
  [   11.046810] cs35l56 sdw:0:2:01fa:3556:01:0: supply VDD_P not found, using dummy regulator
  [   11.046865] cs35l56 sdw:0:2:01fa:3556:01:0: supply VDD_IO not found, using dummy regulator
  [   11.046875] cs35l56 sdw:0:2:01fa:3556:01:0: supply VDD_A not found, using dummy regulator
  [   11.054838] cs35l56 sdw:0:2:01fa:3556:01:0: Cirrus Logic CS35L56 Rev B0 OTP3 fw:3.4.4 (patched=0)
  [   11.062578] cs35l56 sdw:0:2:01fa:3556:01:0: Slave 2 state check1: UNATTACHED, status was 1
  [   11.062778] cs35l56 sdw:0:2:01fa:3556:01:1: supply VDD_P not found, using dummy regulator
  [   11.062831] cs35l56 sdw:0:2:01fa:3556:01:1: supply VDD_IO not found, using dummy regulator
  [   11.062846] cs35l56 sdw:0:2:01fa:3556:01:1: supply VDD_A not found, using dummy regulator
  [   11.070812] cs35l56 sdw:0:2:01fa:3556:01:1: Cirrus Logic CS35L56 Rev B0 OTP3 fw:3.4.4 (patched=0)
  [   11.072524] sof-audio-pci-intel-lnl 0000:00:1f.3:  Topology file:     intel/sof-ipc4-tplg/sof-lnl-cs42l43-l0-cs35l56-l23-2ch.tplg
  [   11.078035] cs35l56 sdw:0:3:01fa:3556:01:2: supply VDD_P not found, using dummy regulator
  [   11.078066] cs35l56 sdw:0:3:01fa:3556:01:2: supply VDD_IO not found, using dummy regulator
  [   11.078071] cs35l56 sdw:0:3:01fa:3556:01:2: supply VDD_A not found, using dummy regulator
  [   11.085803] cs35l56 sdw:0:3:01fa:3556:01:2: Cirrus Logic CS35L56 Rev B0 OTP3 fw:3.4.4 (patched=0)
  [   11.085911] cs35l56 sdw:0:2:01fa:3556:01:1: Slave 1 state check1: UNATTACHED, status was 1
  [   11.089553] cs42l43 sdw:0:0:01fa:4243:01: Slave 6 state check1: UNATTACHED, status was 1
  [   11.092655] cs35l56 sdw:0:3:01fa:3556:01:2: Slave 2 state check1: UNATTACHED, status was 1
  [   11.092663] cs35l56 sdw:0:3:01fa:3556:01:3: supply VDD_P not found, using dummy regulator
  [   11.092683] cs35l56 sdw:0:3:01fa:3556:01:3: supply VDD_IO not found, using dummy regulator
  [   11.092688] cs35l56 sdw:0:3:01fa:3556:01:3: supply VDD_A not found, using dummy regulator
  [   11.099500] cs35l56 sdw:0:3:01fa:3556:01:3: Cirrus Logic CS35L56 Rev B0 OTP3 fw:3.4.4 (patched=0)
  [   11.110428] cs35l56 sdw:0:3:01fa:3556:01:3: Slave 1 state check1: UNATTACHED, status was 1
  [   11.706761] cs42l43-codec cs42l43-codec: supply vdd-amp not found, using dummy regulator
  [   11.735217] cs35l56 sdw:0:2:01fa:3556:01:0: supply VDD_B not found, using dummy regulator
  [   11.735235] cs35l56 sdw:0:2:01fa:3556:01:0: supply VDD_AMP not found, using dummy regulator
  [   11.737319] cs35l56 sdw:0:2:01fa:3556:01:1: supply VDD_B not found, using dummy regulator
  [   11.737344] cs35l56 sdw:0:2:01fa:3556:01:1: supply VDD_AMP not found, using dummy regulator
  [   11.740916] cs35l56 sdw:0:3:01fa:3556:01:2: supply VDD_B not found, using dummy regulator
  [   11.740927] cs35l56 sdw:0:3:01fa:3556:01:2: supply VDD_AMP not found, using dummy regulator
  [   11.743148] cs35l56 sdw:0:3:01fa:3556:01:3: supply VDD_B not found, using dummy regulator
  [   11.743179] cs35l56 sdw:0:3:01fa:3556:01:3: supply VDD_AMP not found, using dummy regulator
  [   11.752570] cs35l56 sdw:0:3:01fa:3556:01:3: DSP1: cirrus/cs35l56-b0-dsp1-misc-10431e13.wmfw: format 3 timestamp 0x65e6703c
  --- 
  ProblemType: Bug
  ApportVersion: 2.33.1-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  ubuntu     2733 F.... wireplumber
   /dev/snd/seq:        ubuntu     2728 F.... pipewire
  CasperMD5CheckResult: pass
  CasperVersion: 25.10.1
  CloudArchitecture: x86_64
  CloudID: nocloud
  CloudName: unknown
  CloudPlatform: nocloud
  CloudSubPlatform: seed-dir (/var/lib/cloud/seed/nocloud)
  CurrentDesktop: ubuntu:GNOME
  DistroRelease: Ubuntu 25.10
  LiveMediaBuild: Ubuntu 25.10 "Questing Quokka" - Beta amd64 (20250917.2)
  MachineType: ASUSTeK COMPUTER INC. ASUS Zenbook S 14 UX5406SA_UX5406SA
  NonfreeKernelModules: zfs
  Package: alsa-driver (not installed)
  ProcEnviron:
   LANG=C.UTF-8
   PATH=(custom, no user)
   SHELL=/bin/bash
   TERM=xterm-256color
   XDG_RUNTIME_DIR=<set>
  ProcVersionSignature: Ubuntu 6.17.0-4.4-generic 6.17.0-rc5
  RebootRequiredPkgs: Error: path contained symlinks.
  Tags: questing wayland-session
  Uname: Linux 6.17.0-4-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo users
  _MarkForUpload: True
  dmi.bios.date: 06/05/2025
  dmi.bios.release: 5.32
  dmi.bios.vendor: American Megatrends International, LLC.
  dmi.bios.version: UX5406SA.308
  dmi.board.asset.tag: ATN12345678901234567
  dmi.board.name: UX5406SA
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: ASUSTeK COMPUTER INC.
  dmi.chassis.version: 1.0
  dmi.ec.firmware.release: 3.19
  dmi.modalias: dmi:bvnAmericanMegatrendsInternational,LLC.:bvrUX5406SA.308:bd06/05/2025:br5.32:efr3.19:svnASUSTeKCOMPUTERINC.:pnASUSZenbookS14UX5406SA_UX5406SA:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnUX5406SA:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:sku:
  dmi.product.family: ASUS Zenbook S 14
  dmi.product.name: ASUS Zenbook S 14 UX5406SA_UX5406SA
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK COMPUTER INC.

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