Public bug reported:
On Dynabook RA/ZYB laptop running Ubuntu 26.04 LTS (kernel 7.0.0-22-generic),
audio is not working correctly.
Hardware:
- Audio Coprocessor: AMD ACP 6.3 [1022:15e2] rev 63, subsystem Dynabook Inc.
[3100:f07b]
- SoundWire codec: Realtek rt722-sdca (sdw:0:0:025d:0722:01)
- Driver in use: snd_pci_ps (legacy path, snd_acp_sdw_legacy_mach)
Issue 1: Internal speakers completely silent
- aplay -l detects Card 1 (amd-soundwire) with devices 0 (SimpleJack) and 2
(SmartAmp)
- wpctl status shows "Audio Coprocessor Speaker" as default sink
- ALSA control "Speaker Switch" is on, volumes at max (87/87)
- speaker-test on hw:1,2 produces no audio even with PipeWire stopped
- Suspected cause: subsystem ID 3100:f07b (Dynabook RA/ZYB) is not registered
in snd_soc_acpi_amd_sdca_quirks, so the SmartAmp function of the rt722
SDCA codec is not properly initialized for this machine.
Issue 2: Headphone jack has periodic dropouts (~1 per second)
- Audio signal is present but interrupted approximately once per second
- dmesg shows: "workqueue: acpi_os_execute_deferred hogged CPU for >10000us"
occurring repeatedly, causing PipeWire buffer underruns
- No ALSA/audio-specific errors in dmesg
Expected: internal speakers and headphones work correctly
Actual: internal speakers completely silent, headphones have periodic dropouts
A quirk entry for subsystem 3100:f07b is likely needed in
sound/soc/amd/ps/acp63-sdca-quirks.c or equivalent.
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: linux-image-7.0.0-22-generic 7.0.0-22.22
ProcVersionSignature: Ubuntu 7.0.0-22.22-generic 7.0.0
Uname: Linux 7.0.0-22-generic x86_64
ApportVersion: 2.34.0-0ubuntu2
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: ryuji 15355 F.... pipewire
ryuji 15356 F.... wireplumber
/dev/snd/controlC0: ryuji 15356 F.... wireplumber
/dev/snd/seq: ryuji 15355 F.... pipewire
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Wed Jun 24 18:38:02 2026
InstallationDate: Installed on 2026-06-22 (2 days ago)
InstallationMedia: Ubuntu 26.04 "Resolute Raccoon" - Release amd64 (20260423.1)
MachineType: Dynabook Inc. dynabook RA/ZYB
ProcEnviron:
LANG=ja_JP.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
TERM=xterm-256color
ProcFB: 0 amdgpudrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-7.0.0-22-generic
root=UUID=002a38ae-4aa4-4550-918d-24be59ef4a54 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: 03/19/2026
dmi.bios.release: 1.80
dmi.bios.vendor: Dynabook Inc.
dmi.bios.version: Version 1.80
dmi.board.asset.tag: 0000000000
dmi.board.name: OK012C/0000
dmi.board.vendor: Dynabook Inc.
dmi.board.version: Version A0
dmi.chassis.asset.tag: 0000000000
dmi.chassis.type: 10
dmi.chassis.vendor: Dynabook Inc.
dmi.chassis.version: Version 1.0
dmi.ec.firmware.release: 1.40
dmi.modalias:
dmi:bvnDynabookInc.:bvrVersion1.80:bd03/19/2026:br1.80:efr1.40:svnDynabookInc.:pndynabookRA/ZYB:pvrW6RAZY7BAH:rvnDynabookInc.:rnOK012C/0000:rvrVersionA0:cvnDynabookInc.:ct10:cvrVersion1.0:skuPGA10N:pfadynabook:
dmi.product.family: dynabook
dmi.product.name: dynabook RA/ZYB
dmi.product.sku: PGA10N
dmi.product.version: W6RAZY7BAH
dmi.sys.vendor: Dynabook Inc.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute
** Attachment added: "logs.tgz"
https://bugs.launchpad.net/bugs/2158074/+attachment/5978713/+files/logs.tgz
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https://bugs.launchpad.net/bugs/2158074
Title:
Dynabook RA/ZYB (AMD ACP 6.3, subsystem 3100:f07b): internal speakers
silent, headphones have periodic dropouts
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