Microphone is silent if left and right channels are set to the same volume

[Leonardo Müller]

If the microphone volume is set the same for both left and right channels, it's nearly silent, being unusable, as if the left and right channel cancel each other.

The workaround I had on Focal was to create a remapped source only with the right channel. However, on jammy, another bug makes this workaround fail.

While I reported the pipewire bug at https://gitlab.freedesktop.org/pipewire/pipewire/-/issues/1734 I'm also reporting this bug so, hopefully, the kernel could be fixed and no workaround would be required in the future.

The following image shows an example of the volume disparity that makes the microphone work properly: https://media.discordapp.net/attachments/327981417407447040/901465383201013800/unknown.png

While such setting allow to use the microphone, it's annoying for the people I'm talking with.

The alsa report can be located at http://alsa-project.org/db/?f=0751ed5c43c0f35e5385971735a518951cb753f0

ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: linux-image-5.13.0-19-generic 5.13.0-19.19
ProcVersionSignature: Ubuntu 5.13.0-19.19-generic 5.13.14
Uname: Linux 5.13.0-19-generic x86_64
ApportVersion: 2.20.11-0ubuntu70
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: usuario 27750 F.... pipewire
                      usuario 27751 F.... wireplumber
 /dev/snd/pcmC0D0p: usuario 27750 F...m pipewire
 /dev/snd/seq: usuario 27750 F.... pipewire
CasperMD5CheckResult: unknown
CurrentDesktop: XFCE
Date: Sat Oct 23 14:51:11 2021
HibernationDevice: # RESUME=UUID=a82e38a0-8d20-49dd-9cbd-de7216b589fc
InstallationDate: Installed on 2017-06-13 (1592 days ago)
InstallationMedia: Xubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
MachineType: LENOVO 80UG
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.13.0-19-generic root=UUID=6b4ae5c0-c78c-49a6-a1ba-029192618a7a ro quiet kvm.ignore_msrs=1 kvm.report_ignored_msrs=0 kvm.halt_poll_ns=0 kvm.halt_poll_ns_grow=0 i915.enable_gvt=1 nbd.nbds_max=2 nbd.max_part=127 mtrr_gran_size=128M mtrr_chunk_size=256M log_buf_len=128M zswap.enabled=1 zswap.zpool=z3fold usbhid.quirks=0x0079:0x0006:0x100000
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
RelatedPackageVersions:
 linux-restricted-modules-5.13.0-19-generic N/A
 linux-backports-modules-5.13.0-19-generic N/A
 linux-firmware 1.202
SourcePackage: linux
UpgradeStatus: Upgraded to jammy on 2019-12-22 (670 days ago)
dmi.bios.date: 08/09/2018
dmi.bios.release: 1.45
dmi.bios.vendor: LENOVO
dmi.bios.version: 0XCN45WW
dmi.board.asset.tag: NO Asset Tag
dmi.board.name: Toronto 4A2
dmi.board.vendor: LENOVO
dmi.board.version: SDK0J40679 WIN
dmi.chassis.asset.tag: NO Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Lenovo ideapad 310-14ISK
dmi.ec.firmware.release: 1.45
dmi.modalias: dmi:bvnLENOVO:bvr0XCN45WW:bd08/09/2018:br1.45:efr1.45:svnLENOVO:pn80UG:pvrLenovoideapad310-14ISK:skuLENOVO_MT_80UG_BU_idea_FM_Lenovoideapad310-14ISK:rvnLENOVO:rnToronto4A2:rvrSDK0J40679WIN:cvnLENOVO:ct10:cvrLenovoideapad310-14ISK:
dmi.product.family: IDEAPAD
dmi.product.name: 80UG
dmi.product.sku: LENOVO_MT_80UG_BU_idea_FM_Lenovo ideapad 310-14ISK
dmi.product.version: Lenovo ideapad 310-14ISK
dmi.sys.vendor: LENOVO
modified.conffile..etc.cron.daily.apport: [deleted]

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This change was made by a bot.