Public bug reported:
[Summary]
On the ASUS ExpertBook PM5406CGA (AMD Ryzen AI 9 HX 470) running Ubuntu 26.04.1
LTS
with kernel 7.0.0-38-generic, the internal speakers produce no sound. The sound
card
is detected, PipeWire shows "Speaker - Ryzen HD Audio Controller", playback
"works"
(no errors, volume slider moves), but the speakers stay silent.
[Hardware]
- Codec: Realtek ALC294 (hwC1D0), subsystem_id 0x10433601
- Speaker amplifiers: 2x Cirrus Logic CS35L41 (rev B2) over I2C, ACPI node
CSC3551
- HDA controller: AMD Ryzen HD Audio Controller [1022:15e3] at 64:00.6
- DMI: system-product-name "ASUS EXPERTBOOK PM5406CGA", baseboard "PM5406CGA"
[Cause]
The cs35l41-hda driver probes both amplifiers successfully:
cs35l41-hda i2c-CSC3551:00-cs35l41-hda.0: Cirrus Logic CS35L41 (35a40),
Revision: B2
cs35l41-hda i2c-CSC3551:00-cs35l41-hda.1: Cirrus Logic CS35L41 (35a40),
Revision: B2
but the Realtek codec has no quirk entry for SSID 1043:3601, so it falls back to
generic pin matching and never binds the CS35L41 amplifiers:
snd_hda_codec_alc269 hdaudioC1D0: ALC294: picked fixup (pin match)
Without ALC287_FIXUP_CS35L41_I2C_2 the amps are never enabled, hence no
output.
[Upstream fix]
Cirrus Logic posted the quirk upstream in March 2026:
"[PATCH v1 2/2] ALSA: hda/realtek: Add support for ASUS 2026 Commercial
laptops
using CS35L41 HDA" (Stefan Binding, series "Add support for various HP and
ASUS
laptops using CS35L41 HDA")
It adds, among others:
SND_PCI_QUIRK(0x1043, 0x3601, "ASUS PM5406CGA", ALC287_FIXUP_CS35L41_I2C_2),
SND_PCI_QUIRK(0x1043, 0x3611, "ASUS PM5606CGA", ALC287_FIXUP_CS35L41_I2C_2),
SND_PCI_QUIRK(0x1043, 0x3701, "ASUS P5406CCA", ALC245_FIXUP_CS35L41_SPI_2),
SND_PCI_QUIRK(0x1043, 0x3711, "ASUS P5606CCA", ALC245_FIXUP_CS35L41_SPI_2),
Patch 1/2 of the same series touches cs35l41_hda_property.c for these models and
may be needed alongside it.
This one-line quirk is not present in the Ubuntu 7.0 kernel. Please consider
backporting it (and patch 1/2 if required) to the resolute linux kernel via SRU.
It is a trivial, model-specific table entry with no impact on other hardware.
[Steps to reproduce]
1. Boot Ubuntu 26.04.1 (7.0.0-38-generic) on an ExpertBook PM5406CGA.
2. Play any audio to the internal speakers.
3. No sound; `journalctl -k | grep "picked fixup"` shows an empty fixup name.
[Expected]
Speakers work out of the box, with the codec picking the CS35L41 I2C fixup.
[Workaround]
None without rebuilding the realtek codec module or using a non-Ubuntu kernel.
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: linux-image-7.0.0-38-generic 7.0.0-38.38
ProcVersionSignature: Ubuntu 7.0.0-38.38-generic 7.0.14
Uname: Linux 7.0.0-38-generic x86_64
ApportVersion: 2.34.1-0ubuntu0.1
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Sun Oct 25 22:04:05 2026
InstallationDate: Installed on 2026-10-17 (8 days ago)
InstallationMedia: Ubuntu 26.04.1 LTS "Resolute Raccoon" - Release amd64
(20260826)
MachineType: ASUS ASUS EXPERTBOOK PM5406CGA
ProcEnviron:
LANG=en_US.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
TERM=xterm-256color
XDG_RUNTIME_DIR=<set>
ProcFB: 0 amdgpudrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-7.0.0-38-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
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No
PulseAudio daemon running, or not running as session daemon.
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 01/16/2026
dmi.bios.release: 2.5
dmi.bios.vendor: ASUSTeK COMPUTER INC. (Licensed by AMI, LLC.)
dmi.bios.version: PM5406CGA.205
dmi.board.asset.tag: ATN12345678901234567
dmi.board.name: PM5406CGA
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: 2.15
dmi.modalias:
dmi:bvnASUSTeKCOMPUTERINC.(LicensedbyAMI,LLC.):bvrPM5406CGA.205:bd01/16/2026:br2.5:efr2.15:svnASUS:pnASUSEXPERTBOOKPM5406CGA:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnPM5406CGA:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:sku:pfaASUSEXPERTBOOK:
dmi.product.family: ASUS EXPERTBOOK
dmi.product.name: ASUS EXPERTBOOK PM5406CGA
dmi.product.version: 1.0
dmi.sys.vendor: ASUS
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute wayland-session
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https://bugs.launchpad.net/bugs/2172184
Title:
No sound from internal speakers on ASUS ExpertBook PM5406CGA (ALC294 +
2x CS35L41, SSID 1043:3601) — missing realtek quirk
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