I've had this issue using Ubuntu 20.04 as installed when my Carbon X1
gen9 was delivered Nov 2021. It persists after updating to Ubuntu 21.10
and 22.04.

More recently, I've tried the 5.15-generic kernel and currently using
the 5.17-oem kernel on 22.04. (No changes to sound quality.)

There was a suggestion that it might be a wonky firmware-sof-signed in
21.10 (see #1956215), but Ubuntu 22.04 has moved beyond the 1.7 version
of the firmware that was giving install errors.

firmware-sof-signed/jammy-updates,jammy-updates,now 2.0-1ubuntu3 all
[installed,automatic]

$ uname -a
5.17.0-1015-oem #16-Ubuntu SMP PREEMPT x86_64 x86_64 x86_64 GNU/Linux

$ lspci | grep -i audio
$ aplay -l
are identical to this report, and dmidecode shows the same hardware
> dmi.product.family: ThinkPad X1 Carbon Gen 9
> dmi.product.name: 20XWCTO1WW

I tried a bunch of approaches that did not fix the audio, see 
https://forums.lenovo.com/t5/Ubuntu/Carbon-X1-Gen9-missing-Bass-speakers/m-p/5116727
The "EasyEffects" solution improves sound quality, but does not fix the issue 
that the sound plays for approximately 1 second at the correct volume before 
cutting out to nearly inaudible. A nice tweak once this underlying issue is 
resolved.

Glad some people have figured out whatever fix was necessary, even if it
was temporary! Gives me hope.

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https://bugs.launchpad.net/bugs/1983293

Title:
  Speaker sound no longer working after 22.04 upgrade on Lenovo X1
  Carbon 9Gen

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  After an upgrade to 22.04 my speakers no longer function properly.
  With the volume at 153% in pavucontrol I can barely hear it (need to
  put my ear almost next to the speaker). I remember I had the same
  issue after a fresh install of 21.04 back in December, but I can no
  longer recall how I fixed it.

  uname -a
  5.15.0-43-generic #46-Ubuntu SMP x86_64 x86_64 x86_64 GNU/Linux

  lspci | grep -i audio
  00:1f.3 Audio device: Intel Corporation Tiger Lake-LP Smart Sound Technology 
Audio Controller (rev 20)

  aplay -l
  **** List of PLAYBACK Hardware Devices ****
  card 0: sofhdadsp [sof-hda-dsp], device 0: HDA Analog (*) []
    Subdevices: 0/1
    Subdevice #0: subdevice #0
  card 0: sofhdadsp [sof-hda-dsp], device 1: HDA Digital (*) []
    Subdevices: 1/1
    Subdevice #0: subdevice #0
  card 0: sofhdadsp [sof-hda-dsp], device 3: HDMI1 (*) []
    Subdevices: 0/1
    Subdevice #0: subdevice #0
  card 0: sofhdadsp [sof-hda-dsp], device 4: HDMI2 (*) []
    Subdevices: 0/1
    Subdevice #0: subdevice #0
  card 0: sofhdadsp [sof-hda-dsp], device 5: HDMI3 (*) []
    Subdevices: 0/1
    Subdevice #0: subdevice #0

  alsamixer has Speaker and Bass Speaker at 00 and those cannot be adjusted, 
see screenshot. DAC1 and DAC2 control left and right speaker respectively (when 
at 0 can not hear anything even with my ear at the speaker).
  --- 
  ProblemType: Bug
  ApportVersion: 2.20.11-0ubuntu82.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  graphite   2307 F.... pulseaudio
  CRDA: N/A
  CasperMD5CheckResult: unknown
  CurrentDesktop: ubuntu:GNOME
  DistroRelease: Ubuntu 22.04
  InstallationDate: Installed on 2022-01-04 (209 days ago)
  InstallationMedia: Ubuntu 20.04.3 LTS "Focal Fossa" - Release amd64 (20210819)
  MachineType: LENOVO 20XWCTO1WW
  Package: linux (not installed)
  ProcFB: 0 i915drmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.15.0-43-generic 
root=/dev/mapper/vgubuntu-root ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 5.15.0-43.46-generic 5.15.39
  RelatedPackageVersions:
   linux-restricted-modules-5.15.0-43-generic N/A
   linux-backports-modules-5.15.0-43-generic  N/A
   linux-firmware                             20220329.git681281e4-0ubuntu3.3
  Tags:  wayland-session jammy
  Uname: Linux 5.15.0-43-generic x86_64
  UpgradeStatus: Upgraded to jammy on 2022-07-27 (5 days ago)
  UserGroups: adm cdrom dip libvirt lpadmin lxd plugdev sambashare sudo tss
  _MarkForUpload: True
  dmi.bios.date: 12/02/2021
  dmi.bios.release: 1.51
  dmi.bios.vendor: LENOVO
  dmi.bios.version: N32ET75W (1.51 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20XWCTO1WW
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Defined
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.ec.firmware.release: 1.31
  dmi.modalias: 
dmi:bvnLENOVO:bvrN32ET75W(1.51):bd12/02/2021:br1.51:efr1.31:svnLENOVO:pn20XWCTO1WW:pvrThinkPadX1CarbonGen9:rvnLENOVO:rn20XWCTO1WW:rvrNotDefined:cvnLENOVO:ct10:cvrNone:skuLENOVO_MT_20XW_BU_Think_FM_ThinkPadX1CarbonGen9:
  dmi.product.family: ThinkPad X1 Carbon Gen 9
  dmi.product.name: 20XWCTO1WW
  dmi.product.sku: LENOVO_MT_20XW_BU_Think_FM_ThinkPad X1 Carbon Gen 9
  dmi.product.version: ThinkPad X1 Carbon Gen 9
  dmi.sys.vendor: LENOVO

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