Public bug reported:
Expected behavior: Internal speakers and headphone jack should be
available as audio output devices.
Actual behavior: Only "Dummy Output" is shown. Internal codec (Realtek
ALC287) fails to initialize.
Ubuntu version:
Ubuntu 26.04 LTS (Resolute Raccoon), kernel 7.0.0-38-generic
Description:
On Lenovo ThinkPad X1 Carbon Gen 10 (21CCS9K500) running Ubuntu 26.04
LTS with kernel 7.0.0, the internal audio codec (Realtek ALC287)
frequently fails to initialize at boot, resulting in "Dummy Output" as
the only available audio device.
Symptoms:
At boot, hda codecs found, mask 4 instead of expected mask 5
codec #0 probe error, ret: -5 appears in dmesg
SoundWire links not enabled
When the bug occurs, aplay -l shows only HDMI and Thunderbolt Dock USB audio,
no analog output:
card 0: sofhdadsp [sof-hda-dsp], device 1: HDMI1 (*) [PHL 271V8LAB]
card 0: sofhdadsp [sof-hda-dsp], device 2: HDMI2 (*) [HDMI 2]
card 0: sofhdadsp [sof-hda-dsp], device 3: HDMI3 (*) [HDMI 3]
card 1: USB [ThinkPad Thunderbolt 3 Dock USB], device 0: USB Audio [USB Audio]
The problem occurs frequently when disconnecting a ThinkPad Thunderbolt 3 Dock
The problem also occurs after using Bluetooth audio output
Sometimes resolves after many reboots and restarting the ALSA daemon, but
behavior is unpredictable
Workaround:
sudo alsa reload
systemctl --user restart pipewire pipewire-pulse wireplumber
Not reliable — sometimes requires many reboots before audio works again.
Relevant dmesg output:
sof-audio-pci-intel-tgl: codec #0 probe error, ret: -5
sof-audio-pci-intel-tgl: SoundWire links not enabled
sof-audio-pci-intel-tgl: hda codecs found, mask 4
sof-audio-pci-intel-tgl: using HDA machine driver skl_hda_dsp_generic
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: linux-image-7.0.0-38-generic 7.0.0-38.38
ProcVersionSignature: Ubuntu 7.0.0-38.38-generic 7.0.14
Uname: Linux 7.0.0-38-generic x86_64
ApportVersion: 2.34.1-0ubuntu0.1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: raimondo 4170 F.... wireplumber
/dev/snd/controlC0: raimondo 4170 F.... wireplumber
/dev/snd/seq: raimondo 4148 F.... pipewire
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Wed Oct 14 19:22:04 2026
InstallationDate: Installed on 2026-06-08 (128 days ago)
InstallationMedia: Ubuntu 26.04 "Resolute Raccoon" - Release amd64 (20260423.1)
MachineType: LENOVO 21CCS9K500
ProcEnviron:
LANG=it_IT.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
TERM=xterm-256color
XDG_RUNTIME_DIR=<set>
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-7.0.0-38-generic
root=UUID=b9fe59b1-92c5-4b5a-bddd-384f8becb9b0 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: 07/21/2026
dmi.bios.release: 1.56
dmi.bios.vendor: LENOVO
dmi.bios.version: N3AET91W (1.56 )
dmi.board.asset.tag: Not Available
dmi.board.name: 21CCS9K500
dmi.board.vendor: LENOVO
dmi.board.version: SDK0K17763 WIN
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.ec.firmware.release: 1.26
dmi.modalias:
dmi:bvnLENOVO:bvrN3AET91W(1.56):bd07/21/2026:br1.56:efr1.26:svnLENOVO:pn21CCS9K500:pvrThinkPadX1CarbonGen10:rvnLENOVO:rn21CCS9K500:rvrSDK0K17763WIN:cvnLENOVO:ct10:cvrNone:skuLENOVO_MT_21CC_BU_Think_FM_ThinkPadX1CarbonGen10:pfaThinkPadX1CarbonGen10:
dmi.product.family: ThinkPad X1 Carbon Gen 10
dmi.product.name: 21CCS9K500
dmi.product.sku: LENOVO_MT_21CC_BU_Think_FM_ThinkPad X1 Carbon Gen 10
dmi.product.version: ThinkPad X1 Carbon Gen 10
dmi.sys.vendor: LENOVO
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute wayland-session
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https://bugs.launchpad.net/bugs/2170869
Title:
ThinkPad X1 Carbon Gen 10 (ALC287) - audio codec not initialized at
boot, "Dummy Output" issue
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