Public bug reported:
## Summary
No audio output on ASUS Zenbook S 14 UX5406SA with Intel Lunar Lake.
PipeWire falls back to "Dummy Output" because the cs42l43 SoundWire codec
fails.
## Hardware
- ASUS Zenbook S 14 UX5406SA
- Intel Lunar Lake
- Audio: CS42L43 (headphones) + CS35L56 (speakers) via SoundWire
## Symptoms
- wpctl status shows only "Dummy Output" as sink
- speaker-test produces no sound
- Kernel logs show: cs42l43 sdw:0:0:01fa:4243:01: Failed to read IRQ status:
-16
## Kernel
6.17.0-8-generic
## Notes
- ALSA detects the card correctly (aplay -l shows devices)
- Firmware loads successfully (cs35l56 tuning applied per journalctl)
ProblemType: Bug
DistroRelease: Ubuntu 25.10
Package: linux-image-6.17.0-8-generic 6.17.0-8.8
ProcVersionSignature: Ubuntu 6.17.0-8.8-generic 6.17.2
Uname: Linux 6.17.0-8-generic x86_64
ApportVersion: 2.33.1-0ubuntu3
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: maud 132693 F.... wireplumber
/dev/snd/seq: maud 132691 F.... pipewire
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Sun Jan 25 22:40:49 2026
InstallationDate: Installed on 2025-06-13 (226 days ago)
InstallationMedia: Ubuntu 25.04 "Plucky Puffin" - Release amd64 (20250415.3)
MachineType: ASUSTeK COMPUTER INC. ASUS Zenbook S 14 UX5406SA_UX5406SA
ProcEnviron:
LANG=fr_FR.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
TERM=xterm-256color
XDG_RUNTIME_DIR=<set>
ProcFB: 0 xedrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-6.17.0-8-generic
root=/dev/mapper/ubuntu--vg-ubuntu--lv ro quiet splash
crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M
vt.handoff=7
RelatedPackageVersions:
firmware-sof N/A
linux-firmware 20250901.git993ff19b-0ubuntu1.5
SourcePackage: linux
UpgradeStatus: Upgraded to questing on 2025-11-05 (81 days ago)
dmi.bios.date: 11/08/2024
dmi.bios.release: 5.32
dmi.bios.vendor: American Megatrends International, LLC.
dmi.bios.version: UX5406SA.303
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: 3.17
dmi.modalias:
dmi:bvnAmericanMegatrendsInternational,LLC.:bvrUX5406SA.303:bd11/08/2024:br5.32:efr3.17: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.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug questing wayland-session
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https://bugs.launchpad.net/bugs/2139046
Title:
[Lunar Lake] No audio - cs42l43 "Failed to read IRQ status: -16" on
ASUS Zenbook S 14 UX5406SA
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