Public bug reported:
The internal digital microphone array on a Lenovo ThinkPad E14 Gen 7
(DMI product name `21T0CTO1WW`) does not capture any audio under Ubuntu
24.04.4 with kernel 6.17.0-22-generic. The PCM device enumerates, opens,
and streams without errors — but every captured sample is a single fixed
DC value, so applications see "silence." This appears to be a missing
board-specific quirk in the AMD ACP6.3 (Pink Sardine) machine driver:
`sound/soc/amd/ps/ps-mach.c` has no DMI quirk table, and grepping
mainline (`torvalds/linux` master) for `21T0` returns zero matches
across `sound/soc/amd/{ps,acp,yc}/` and `sound/soc/sof/amd/`.
The same hardware family (ThinkPad E14 Gen 6, ACP6.0/6.1) had analogous
mic problems fixed by adding DMI entries to
`sound/soc/amd/yc/acp6x-mach.c`'s `yc_acp_quirk_table` — that mechanism
does not appear to exist for the newer `ps` driver, and `21T0` is not
registered anywhere.
ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: linux-image-6.17.0-22-generic 6.17.0-22.22~24.04.1
ProcVersionSignature: Ubuntu 6.17.0-22.22~24.04.1-generic 6.17.13
Uname: Linux 6.17.0-22-generic x86_64
ApportVersion: 2.28.1-0ubuntu3.8
Architecture: amd64
CRDA: N/A
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Thu May 7 06:27:26 2026
InstallationDate: Installed on 2025-12-05 (153 days ago)
InstallationMedia: Ubuntu 24.04.1 LTS "Noble Numbat" - Release amd64
(20240827.1)
MachineType: LENOVO 21T0CTO1WW
ProcEnviron:
LANG=en_US.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
TERM=xterm-256color
XDG_RUNTIME_DIR=<set>
ProcFB: 0 amdgpudrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-6.17.0-22-generic
root=UUID=87120414-7f5c-4e6f-a7b8-78887857c97b ro quiet splash vt.handoff=7
RebootRequiredPkgs: Error: path contained symlinks.
RelatedPackageVersions:
linux-restricted-modules-6.17.0-22-generic N/A
linux-backports-modules-6.17.0-22-generic N/A
linux-firmware 20240318.git3b128b60-0ubuntu2.27
SourcePackage: linux-hwe-6.17
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/23/2025
dmi.bios.release: 1.10
dmi.bios.vendor: LENOVO
dmi.bios.version: R2ZET27W (1.10 )
dmi.board.asset.tag: Not Available
dmi.board.name: 21T0CTO1WW
dmi.board.vendor: LENOVO
dmi.board.version: Not Defined
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.ec.firmware.release: 1.10
dmi.modalias:
dmi:bvnLENOVO:bvrR2ZET27W(1.10):bd07/23/2025:br1.10:efr1.10:svnLENOVO:pn21T0CTO1WW:pvrThinkPadE14Gen7:rvnLENOVO:rn21T0CTO1WW:rvrNotDefined:cvnLENOVO:ct10:cvrNone:skuLENOVO_MT_21T0_BU_Think_FM_ThinkPadE14Gen7:
dmi.product.family: ThinkPad E14 Gen 7
dmi.product.name: 21T0CTO1WW
dmi.product.sku: LENOVO_MT_21T0_BU_Think_FM_ThinkPad E14 Gen 7
dmi.product.version: ThinkPad E14 Gen 7
dmi.sys.vendor: LENOVO
** Affects: linux-hwe-6.17 (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug noble
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https://bugs.launchpad.net/bugs/2151763
Title:
linux-hwe-6.17: internal digital microphone silent on ThinkPad E14 Gen
7 (21T0CTO1WW) — DMIC stream stuck at constant DC value (no DMI quirk
in sound/soc/amd/ps)
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