Public bug reported:
Summary: No audio output from internal speakers on LG gram 16Z90U-H.AU87U1
(Intel Panther Lake platform),
despite the entire audio stack reporting correct, unmuted, full-volume state.
Hardware: LG Electronics 16Z90U-H.AU87U1, SoundWire audio via
sof-audio-pci-intel-ptl (0000:00:1f.3). Speaker
amp is a Realtek RT1320-SDCA (SoundWire link 1, mfg_id 0x025d part_id
0x1320). Mic/headset codec is RT712-SDCA
(link 3, part_id 0x0713). SOF firmware version 2.14.1.1 (IPC4).
Kernel: 7.0.0-31-generic. linux-firmware 20260319.git217ca6e4. Both are the
latest available via apt. fwupdmgr
get-updates shows no relevant BIOS/EC firmware update.
Symptom: No sound from internal speakers, in any application. pactl/wpctl
status show the Speaker sink as
RUNNING, unmuted, 100% volume, with an active stream connected to it. ALSA
simple-mixer controls (Speaker, Post
Mixer Speaker, Pre Mixer Speaker) are all on/100%. Despite this, no audible
output.
Isolated below PipeWire: Stopped pipewire/pipewire-pulse/wireplumber entirely
and ran speaker-test -D hw:0,2 -c2
-twav -l1 directly against the ALSA hardware device — still completely
silent. This rules out
PipeWire/WirePlumber routing as the cause; the fault is in the kernel/DSP/amp
path itself.
Relevant kernel log line:
sof-audio-pci-intel-ptl 0000:00:1f.3: No SoundWire machine driver found for
the ACPI-reported configuration:
sof-audio-pci-intel-ptl 0000:00:1f.3: link 1 mfg_id 0x025d part_id 0x1320
version 0x3
sof-audio-pci-intel-ptl 0000:00:1f.3: link 3 mfg_id 0x025d part_id 0x0713
version 0x3
sof-audio-pci-intel-ptl 0000:00:1f.3: Use SoundWire default machine driver
with function topologies
No model-specific machine driver/quirk exists for this ACPI configuration, so
the kernel falls back to a generic
function-topology driver, which appears not to fully enable the speaker
output on this model.
Secondary bug (confirmed separate from the above): SoundWire runtime
autosuspend (3s idle timer) repeatedly
fails on the amp:
rt1320-sdca sdw:0:1:025d:1320:01: rt1320_pde_transition_delay PDE to PS3 is
NOT ready
Disabling autosuspend via echo on >
/sys/bus/soundwire/devices/sdw:0:1:025d:1320:01/power/control (made
persistent via udev rule) eliminated this specific error on subsequent boots,
but audio output was still absent
— so this is a real bug but not the root cause of the silence.
Also observed at every boot:
alsactl: set_control:1521: Cannot write control
'numid=7,iface=MIXER,name='rt1320-1 R0 Load Mode'' : Invalid
argument
Already ruled out: mute/volume state, PipeWire/WirePlumber configuration,
suspend/resume cycling (issue persists
after resume), missing kernel/firmware updates (already latest), missing BIOS
firmware update (none available
via fwupd).
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: linux-image-7.0.0-31-generic 7.0.0-31.31
ProcVersionSignature: Ubuntu 7.0.0-31.31-generic 7.0.14
Uname: Linux 7.0.0-31-generic x86_64
ApportVersion: 2.34.1-0ubuntu0.1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: ryan 3369 F.... pipewire
ryan 3378 F.... wireplumber
/dev/snd/seq: ryan 3369 F.... pipewire
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Mon Sep 21 22:03:04 2026
InstallationDate: Installed on 2026-09-19 (2 days ago)
InstallationMedia: Ubuntu 26.04.1 LTS "Resolute Raccoon" - Release amd64
(20260826)
Lsusb:
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 002: ID 04f2:b88b Chicony Electronics Co., Ltd LGE Camera
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
MachineType: LG Electronics 16Z90U-H.AU87U1
ProcEnviron:
LANG=en_US.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
TERM=xterm-256color
XDG_RUNTIME_DIR=<set>
ProcFB: 0 xedrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-7.0.0-31-generic
root=UUID=98a4d959-fb3b-4440-921b-66cf03d1c892 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: 01/22/2026
dmi.bios.release: 0.1
dmi.bios.vendor: Phoenix Technologies Ltd.
dmi.bios.version: P1ZK3080 X64
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: 16Z90U
dmi.board.vendor: LG Electronics
dmi.board.version: FAB1
dmi.chassis.asset.tag: Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LG Electronics
dmi.chassis.version: 0.1
dmi.ec.firmware.release: 25.0
dmi.modalias:
dmi:bvnPhoenixTechnologiesLtd.:bvrP1ZK3080X64:bd01/22/2026:br0.1:efr25.0:svnLGElectronics:pn16Z90U-H.AU87U1:pvr0.1:rvnLGElectronics:rn16Z90U:rvrFAB1:cvnLGElectronics:ct10:cvr0.1:skuEVO:pfagramPro:
dmi.product.family: gram Pro
dmi.product.name: 16Z90U-H.AU87U1
dmi.product.sku: EVO
dmi.product.version: 0.1
dmi.sys.vendor: LG Electronics
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute wayland-session
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https://bugs.launchpad.net/bugs/2167912
Title:
No audio output from internal speakers on LG gram 16Z90U-H.AU87U1
(Intel Panther Lake platform), despite the entire audio stack
reporting correct, unmuted, full-volume state.
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