Public bug reported:
Laptop Model: ASUS Zenbook 14 UX3480KA
Audio Hardware:
63:00.5 Multimedia controller [0480]: Advanced Micro Devices, Inc. [AMD]
Audio Coprocessor [1022:15e2] (rev 72)
The Problem: The HDA path (63:00.1) works for HDMI, but the ACP path
(63:00.5) fails to create a sound card for the internal speakers,
resulting in "Dummy Output".
The Fix Needed: A kernel DMI quirk is required for the UX3480KA in the
snd_pci_ps or snd_rn_pci_acp3x drivers, similar to the patches recently
submitted for other Zenbook models (e.g., Zenbook S16 UM5606GA).
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: linux-image-7.0.0-42-generic 7.0.0-42.42
ProcVersionSignature: Ubuntu 7.0.0-42.42-generic 7.0.14
Uname: Linux 7.0.0-42-generic x86_64
ApportVersion: 2.34.1-0ubuntu0.1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: hannah 6244 F.... wireplumber
/dev/snd/seq: hannah 6230 F.... pipewire
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Sat Oct 31 16:52:59 2026
InstallationDate: Installed on 2026-10-29 (2 days ago)
InstallationMedia: Ubuntu 26.04.1 LTS "Resolute Raccoon" - Release amd64
(20260826)
MachineType: ASUS Zenbook 14 UX3480KA
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-7.0.0-42-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
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 09/14/2026
dmi.bios.release: 5.35
dmi.bios.vendor: American Megatrends International, LLC.
dmi.bios.version: UX3480KA.303
dmi.board.asset.tag: ATN12345678901234567
dmi.board.name: UX3480KA
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: 3.3
dmi.modalias:
dmi:bvnAmericanMegatrendsInternational,LLC.:bvrUX3480KA.303:bd09/14/2026:br5.35:efr3.3:svnASUS:pnZenbook14UX3480KA:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnUX3480KA:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:sku:pfaZenbook14:
dmi.product.family: Zenbook 14
dmi.product.name: Zenbook 14 UX3480KA
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/2172672
Title:
Dummy Output on ASUS Zenbook 14 UX3480KA (AMD ACP 1022:15e2) -
internal speakers not detected
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