I did try to debug this a little bit (newbie here).
Based on the kernel documentation of the sound subsystem
(https://www.kernel.org/doc/html/latest/sound/hd-audio/notes.html), I
managed to narrow down the issue to the /sound/pci/hda/patch_conexant.c
When I do the following the mic correctly works without needing to mute one
channel:
- $ systemctl --user stop pulseaudio.socket
- $ systemctl --user stop pulseaudio.service
- # echo inv_dmic_split=yes > /sys/class/sound/hwC0D0/hints
- # echo 1 > /sys/class/sound/hwC0D0/reconfig
- $ systemctl --user start pulseaudio.service
- $ systemctl --user start pulseaudio.socket
However there is background noise. Am I on a good track?
I was thinking to add to the kernel this line of code to patch_conexant.c:
SND_PCI_QUIRK(0x17aa, 0x3828, "Lenovo IdeaPad 310",
CXT_FIXUP_STEREO_DMIC),
Does it seem a good approach?
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https://bugs.launchpad.net/bugs/2011623
Title:
[Lenovo Ideapad 310][80SM, Conexant CX20751/2, Mic, Internal] Inverted
internal microphone
Status in linux package in Ubuntu:
Confirmed
Bug description:
The internal mic does not work out-of-the-box. The recorded sound is
barely audible on many apps, such as Skype, Teams, Zoom.
Quick fix is to mute one of the channel.
Same issue as described here:
https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1002978
SourcePackage: alsa-driver
Symptom: audio
Symptom_AlsaRecordingTest: ALSA recording test through plughw:PCH successful
Symptom_Card: Built-in Audio - HDA Intel PCH
Symptom_Jack: Mic, Internal
Symptom_PulseAudioRecordingTest: PulseAudio recording test through plughw:PCH
successful
Symptom_Type: None of the above
Tags: jammy
Title: [80SM, Conexant CX20751/2, Mic, Internal] Recording problem
Uname: Linux 5.15.0-67-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
_MarkForUpload: True
dmi.bios.date: 03/21/2016
dmi.bios.release: 1.23
dmi.bios.vendor: LENOVO
dmi.bios.version: 0XCN23WW
dmi.board.asset.tag: NO Asset Tag
dmi.board.name: Toronto 5A2
dmi.board.vendor: LENOVO
dmi.board.version: 31900002 WIN
dmi.chassis.asset.tag: NO Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Lenovo ideapad 310-15ISK
dmi.ec.firmware.release: 1.23
dmi.modalias:
dmi:bvnLENOVO:bvr0XCN23WW:bd03/21/2016:br1.23:efr1.23:svnLENOVO:pn80SM:pvrLenovoideapad310-15ISK:rvnLENOVO:rnToronto5A2:rvr31900002WIN:cvnLENOVO:ct10:cvrLenovoideapad310-15ISK:skuLENOVO_MT_80SM_BU_idea_FM_Lenovoideapad310-15ISK:
dmi.product.family: IDEAPAD
dmi.product.name: 80SM
dmi.product.sku: LENOVO_MT_80SM_BU_idea_FM_Lenovo ideapad 310-15ISK
dmi.product.version: Lenovo ideapad 310-15ISK
dmi.sys.vendor: LENOVO
---
ProblemType: Bug
ApportVersion: 2.20.11-0ubuntu82.3
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: janclod 1105 F.... pulseaudio
CRDA: N/A
CasperMD5CheckResult: pass
CurrentDesktop: XFCE
DistroRelease: Ubuntu 22.04
InstallationDate: Installed on 2023-03-07 (7 days ago)
InstallationMedia: Xubuntu 22.04.1 LTS "Jammy Jellyfish" - Release amd64
(20220809.1)
MachineType: LENOVO 80SM
Package: linux (not installed)
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.15.0-67-generic
root=UUID=73afdd96-ca5a-45fd-bd9f-d12d53abf7c0 ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 5.15.0-67.74-generic 5.15.85
RelatedPackageVersions:
linux-restricted-modules-5.15.0-67-generic N/A
linux-backports-modules-5.15.0-67-generic N/A
linux-firmware 20220329.git681281e4-0ubuntu3.10
Tags: jammy
Uname: Linux 5.15.0-67-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin lxd plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 03/21/2016
dmi.bios.release: 1.23
dmi.bios.vendor: LENOVO
dmi.bios.version: 0XCN23WW
dmi.board.asset.tag: NO Asset Tag
dmi.board.name: Toronto 5A2
dmi.board.vendor: LENOVO
dmi.board.version: 31900002 WIN
dmi.chassis.asset.tag: NO Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Lenovo ideapad 310-15ISK
dmi.ec.firmware.release: 1.23
dmi.modalias:
dmi:bvnLENOVO:bvr0XCN23WW:bd03/21/2016:br1.23:efr1.23:svnLENOVO:pn80SM:pvrLenovoideapad310-15ISK:rvnLENOVO:rnToronto5A2:rvr31900002WIN:cvnLENOVO:ct10:cvrLenovoideapad310-15ISK:skuLENOVO_MT_80SM_BU_idea_FM_Lenovoideapad310-15ISK:
dmi.product.family: IDEAPAD
dmi.product.name: 80SM
dmi.product.sku: LENOVO_MT_80SM_BU_idea_FM_Lenovo ideapad 310-15ISK
dmi.product.version: Lenovo ideapad 310-15ISK
dmi.sys.vendor: LENOVO
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