Public bug reported:
### Summary
The internal microphone on my Fujitsu FMV LIFEBOOK M55-K3 (FMVM55K3SA)
does not work under Ubuntu 26.04 LTS.
The microphone is detected by ALSA and PipeWire, but every recording
contains only silence.
The issue is reproducible on both a normal Ubuntu installation and the
Ubuntu 26.04 Live USB environment.
The same hardware works correctly under Windows, where the internal
microphone records normally.
### System Information
Manufacturer:
FUJITSU CLIENT COMPUTING LIMITED
Product Name:
FMVM55K3SA
Family:
FMV Note -JR
Operating System:
Ubuntu 26.04 LTS
Kernel:
7.0.0-27-generic
Audio Hardware:
- AMD Audio Coprocessor
- AMD Ryzen HD Audio Controller
- Realtek ALC257
### Steps to Reproduce
1. Boot Ubuntu 26.04.
2. Open a terminal.
3. Record audio:
arecord -d 5 test.wav
4. Speak into the built-in microphone.
5. Play the recording:
aplay test.wav
### Expected Result
The recorded file should contain audio captured by the internal
microphone.
### Actual Result
The recording contains only silence.
### Investigation Results
The issue was reproduced on:
- Ubuntu 26.04 installed system
- Ubuntu 26.04 Live USB
Windows detects and records from the internal microphone correctly.
The microphone is detected by ALSA:
$ arecord -l
card 1: Generic_1 [HD-Audio Generic], device 0: ALC257 Analog
PipeWire also detects an input source:
alsa_input.pci-0000_32_00.6.analog-stereo
However:
analog-input-mic
availability: not available
Recording with:
arecord -d 5 test.wav
always produces silence.
The following AMD audio modules are loaded:
snd_pci_acp6x
snd_sof_amd_acp
snd_soc_acp6x_mach
snd_acp6x_pdm_dma
The kernel log contains:
snd_hda_codec_alc269 hdaudioC1D0: ALC257: SKU not ready 0x909701f0
No audio firmware loading errors are reported in dmesg.
The available ALSA capture devices are only:
hw:CARD=Generic_1,DEV=0
plughw:CARD=Generic_1,DEV=0
sysdefault:CARD=Generic_1
front:CARD=Generic_1,DEV=0
dsnoop:CARD=Generic_1,DEV=0
/proc/asound/cards shows only HDA devices:
0 [Generic] : HDA-Intel
1 [Generic_1] : HDA-Intel
No additional ACP/DMIC capture device appears.
### Additional Information
This issue is reproducible on a clean Ubuntu 26.04 Live USB environment,
suggesting that it is not caused by user configuration or installed
packages.
The internal microphone works correctly under Windows on the same
hardware.
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/controlC1: abe 4062 F.... wireplumber
/dev/snd/controlC0: abe 4062 F.... wireplumber
/dev/snd/seq: abe 4047 F.... pipewire
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Mon Jul 27 17:42:27 2026
InstallationDate: Installed on 2026-05-04 (84 days ago)
InstallationMedia: Ubuntu 26.04 "Resolute Raccoon" - Release amd64 (20260423.1)
MachineType: FUJITSU CLIENT COMPUTING LIMITED FMVM55K3SA
ProcEnviron:
LANG=ja_JP.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
TERM=xterm-256color
XDG_RUNTIME_DIR=<set>
ProcFB: 0 amdgpudrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-7.0.0-27-generic
root=UUID=8a331b16-4005-4c8d-96c6-1f85db5de4b6 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: 11/19/2025
dmi.bios.release: 1.8
dmi.bios.vendor: FUJITSU CLIENT COMPUTING LIMITED
dmi.bios.version: Version 1.08
dmi.board.name: FJNBB89
dmi.board.vendor: FUJITSU CLIENT COMPUTING LIMITED
dmi.board.version: 868088-01R5X00212
dmi.chassis.type: 10
dmi.chassis.vendor: FUJITSU CLIENT COMPUTING LIMITED
dmi.ec.firmware.release: 1.7
dmi.modalias:
dmi:bvnFUJITSUCLIENTCOMPUTINGLIMITED:bvrVersion1.08:bd11/19/2025:br1.8:efr1.7:svnFUJITSUCLIENTCOMPUTINGLIMITED:pnFMVM55K3SA:pvr:rvnFUJITSUCLIENTCOMPUTINGLIMITED:rnFJNBB89:rvr868088-01R5X00212:cvnFUJITSUCLIENTCOMPUTINGLIMITED:ct10:cvr:skuSK00:pfaFMVNote-JR:
dmi.product.family: FMV Note -JR
dmi.product.name: FMVM55K3SA
dmi.product.sku: SK00
dmi.sys.vendor: FUJITSU CLIENT COMPUTING LIMITED
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute wayland-session
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https://bugs.launchpad.net/bugs/2161878
Title:
Internal microphone records only silence on Fujitsu FMV LIFEBOOK
M55-K3 (FMVM55K3SA)
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