Public bug reported:
Hardware:
- Model: LG Gram 16Z90U-KU7WK
- Audio: Intel Panther Lake SoundWire
- Components shown by pactl: spk:rt1320 hs:rt713-sdca
- Ubuntu: 26.04 LTS
- Kernel: 7.0.0-27-generic
- PipeWire: 1.6.2
Problem:
Internal speakers do not produce sound.
Headphones also do not produce sound.
PipeWire shows audio activity, but no sound is heard.
Only HDMI playback devices are exposed by ALSA.
aplay -l shows only:
- HDMI1
- HDMI2
- HDMI3
No internal speaker PCM is exposed.
Important dmesg lines:
- No SoundWire machine driver found for the ACPI-reported configuration
- Use SoundWire default machine driver with function topologies
- Using function topology: intel/sof-ipc4-tplg/sof-ptl-dummy-2ch.tplg
- SoundWire links detected:
- link 1: part_id 0x1320
- link 3: part_id 0x0713
- rt712/rt713-sdca messages also appear.
What I tried:
- Reinstalled linux-firmware, firmware-sof-signed, alsa-ucm-conf, pipewire,
wireplumber, pipewire-pulse
- Reset ~/.local/state/wireplumber, ~/.config/pipewire, ~/.config/pulse
- Checked alsamixer and unmuted Speaker/Headphone/rt1320 controls
- Tried pro-audio profile
- Tried pro-output-5/6/7
- Ran full system updates
- Rebooted several times
Expected:
Internal speakers and headphone jack should appear as usable audio outputs and
produce sound.
Actual:
Only HDMI PCMs are exposed, and internal speakers/headphones remain silent.
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: linux-image-7.0.0-27-generic 7.0.0-27.27
ProcVersionSignature: Ubuntu 7.0.0-27.27-generic 7.0.6
Uname: Linux 7.0.0-27-generic x86_64
ApportVersion: 2.34.0-0ubuntu2
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/seq: user 4331 F.... pipewire
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Thu Jul 9 00:23:05 2026
InstallationDate: Installed on 2026-07-08 (0 days ago)
InstallationMedia: Ubuntu 26.04 "Resolute Raccoon" - Release amd64 (20260423.1)
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 30c9:00f2 Luxvisions Innotech Limited LGE Camera
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
MachineType: LG Electronics 16Z90U-KU7WK
ProcFB: 0 xedrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-7.0.0-27-generic
root=UUID=e60616c1-96a9-4d93-b4b7-d8a71711ed54 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-KU7WK:pvr0.1:rvnLGElectronics:rn16Z90U:rvrFAB1:cvnLGElectronics:ct10:cvr0.1:skuEVO:pfagramPro:
dmi.product.family: gram Pro
dmi.product.name: 16Z90U-KU7WK
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/2160153
Title:
LG Gram 16Z90U-KU7WK internal speakers/headphone not working:
SoundWire rt1320/rt713 exposes only HDMI PCMs
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