Public bug reported:
Hardware:
- Lenovo ThinkPad E16 Gen 4 (21YC006MIX), BIOS R3AET28W (1.02), latest
available via fwupd
- Codec: Conexant SN6140 (snd_hda_codec_conexant), HDA Intel PCH
- Kernel: 7.0.0-38-generic (Ubuntu 26.04 "resolute"), PipeWire
Problem:
No sound from the 3.5mm headphone jack and no sound from the internal speakers
either. The digital side works.
Observations:
- Kernel log: "SN6140: picked fixup for PCI SSID 17aa:0000". The subsystem ID
is empty, so no model-specific quirk is applied.
- Jack detection works: PipeWire reports analog-output-headphones available=yes.
- PCM stream is RUNNING and hw_ptr advances during playback (speaker-test).
- Mixer: Master and Headphone unmuted at 100%; DAC 0x10 Amp-Out not muted;
HP pin 0x16 Pin-ctls 0xc0 (OUT HP), EAPD set, connected to DAC 0x10.
- Codec GPIOs (5 IOs) all disabled by default.
Already tried, without success:
- Driving each GPIO high individually (data 0x01..0x10) and all together (0x1F)
via hda-verb
- Unmuting the Speaker control with headphones inserted (to rule out swapped
pins 0x16/0x17)
- snd_hda_intel power_save=0
- BIOS update (none available)
Expected: audio on the headphone jack and on the internal speakers.
The empty SSID probably means the machine needs a quirk entry (or an SSID
fixup) in the Conexant driver.
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/controlC0: alice 3957 F.... wireplumber
/dev/snd/seq: alice 3948 F.... pipewire
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Sun Oct 25 16:51:14 2026
InstallationDate: Installed on 2026-09-13 (42 days ago)
InstallationMedia: Ubuntu 26.04.1 LTS "Resolute Raccoon" - Release amd64
(20260826)
MachineType: LENOVO 21YC006MIX
ProcEnviron:
LANG=en_US.UTF-8
PATH=(custom, no user)
SHELL=/usr/bin/zsh
TERM=xterm-ghostty
XDG_RUNTIME_DIR=<set>
ProcFB: 0 xedrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-7.0.0-38-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: 03/13/2026
dmi.bios.release: 1.2
dmi.bios.vendor: LENOVO
dmi.bios.version: R3AET28W(1.02 )
dmi.board.asset.tag: Not Available
dmi.board.name: 21YC006MIX
dmi.board.vendor: LENOVO
dmi.board.version: SDK0T76576 WIN
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.ec.firmware.release: 1.2
dmi.modalias:
dmi:bvnLENOVO:bvrR3AET28W(1.02):bd03/13/2026:br1.2:efr1.2:svnLENOVO:pn21YC006MIX:pvrThinkPadE16Gen4:rvnLENOVO:rn21YC006MIX:rvrSDK0T76576WIN:cvnLENOVO:ct10:cvrNone:skuLENOVO_MT_21YC_BU_Think_FM_ThinkPadE16Gen4:pfaThinkPadE16Gen4:
dmi.product.family: ThinkPad E16 Gen 4
dmi.product.name: 21YC006MIX
dmi.product.sku: LENOVO_MT_21YC_BU_Think_FM_ThinkPad E16 Gen 4
dmi.product.version: ThinkPad E16 Gen 4
dmi.sys.vendor: LENOVO
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute wayland-session
** Bug watch added: github.com/thesofproject/linux/issues #5926
https://github.com/thesofproject/linux/issues/5926
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https://bugs.launchpad.net/bugs/2172171
Title:
[ThinkPad E16 Gen 4] No analog audio output (headphone jack and
speakers) on Conexant SN6140, PCI SSID 17aa:0000
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