Similar problem with:
- Ubuntu 20.04 LTS
- Fujitsu LifeBook A530
- $ lspci | grep Audio
00:1b.0 Audio device: Intel Corporation 5 Series/3400 Series Chipset High 
Definition Audio (rev 05)

THE PROBLEM:
No sound. Gnome audio system settings shows "Dummy Audio" as output device.

Trying with Lubuntu 20.04 on a different partition there's the same problem but 
running PulseAudio Volume Control it's possible to select: "analog stereo 
duplex" or "analog stereo output".
Unfortunately there is no setting like this for Gnome.


WORKAROUND:
As reported here https://forum.ubuntu-it.org/viewtopic.php?t=413914 it seems to 
be a problem related to udev which doesn't find the audio card.

1. Inside /etc/pulse/default.pa find the following code:

.ifexists module-udev-detect.so
load-module module-udev-detect
.else
### Alternatively use the static hardware detection module (for systems that
### lack udev support)
load-module module-detect
.endif

2. Comment the if/else statement:

### Automatically load driver modules depending on the hardware available
#.ifexists module-udev-detect.so
#load-module module-udev-detect
#.else
### Alternatively use the static hardware detection module (for systems that
### lack udev support)
load-module module-detect
#.endif

3. Save the file and restart.

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https://bugs.launchpad.net/bugs/1864871

Title:
  Failed to init Intel sound card in 20.04

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  After installing current 20.04 release on ThinkBook 13s IML with Intel
  audio card there is no sound available because sound card not detected
  (only dummy output available in sound settings):

  $ alsamixer 
  cannot open mixer: No such file or directory

  $ lspci -nnk |grep -A2 audio
  lspci: Unable to load libkmod resources: error -12
  00:1f.3 Multimedia audio controller [0401]: Intel Corporation Device 
[8086:02c8]
        Subsystem: Lenovo Device [17aa:3816]
        Kernel driver in use: sof-audio-pci
  00:1f.4 SMBus [0c05]: Intel Corporation Device [8086:02a3]
        Subsystem: Lenovo Device [17aa:3819]

  $ pacmd list-cards 
  0 card(s) available.

  $ dmesg |grep sof
  [    0.755398] PCI-DMA: Using software bounce buffering for IO (SWIOTLB)
  [    0.755400] software IO TLB: mapped [mem 0x7d91d000-0x8191d000] (64MB)
  [    2.142149] systemd[1]: Mounting Mount unit for software-boutique, 
revision 54...
  [    2.333772] systemd[1]: Mounted Mount unit for software-boutique, revision 
54.
  [    2.770307] sof-audio-pci 0000:00:1f.3: warning: No matching ASoC machine 
driver found
  [    2.770316] sof-audio-pci 0000:00:1f.3: DSP detected with PCI 
class/subclass/prog-if 0x040100
  [    2.770473] sof-audio-pci 0000:00:1f.3: use msi interrupt mode
  [    2.770696] sof-audio-pci 0000:00:1f.3: bound 0000:00:02.0 (ops 
i915_audio_component_bind_ops [i915])
  [    2.779359] sof-audio-pci 0000:00:1f.3: hda codecs found, mask 5
  [    2.779360] sof-audio-pci 0000:00:1f.3: using HDA machine driver 
skl_hda_dsp_generic now
  [    2.817051] sof-audio-pci 0000:00:1f.3: Direct firmware load for 
intel/sof/sof-cnl.ri failed with error -2
  [    2.817054] sof-audio-pci 0000:00:1f.3: error: request firmware 
intel/sof/sof-cnl.ri failed err: -2
  [    2.817057] sof-audio-pci 0000:00:1f.3: error: failed to load DSP firmware 
-2
  [    2.817058] sof-audio-pci 0000:00:1f.3: error: sof_probe_work failed err: 
-2

  I've found similar bug reported here:
  https://bugs.archlinux.org/task/64720

  As a workaround I've added `snd_hda_intel.dmic_detect=0` to boot
  options and after that sound card successfully detected and started
  working.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: linux-image-5.4.0-14-generic 5.4.0-14.17
  ProcVersionSignature: Ubuntu 5.4.0-14.17-generic 5.4.18
  Uname: Linux 5.4.0-14-generic x86_64
  ApportVersion: 2.20.11-0ubuntu18
  Architecture: amd64
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  CurrentDesktop: MATE
  Date: Wed Feb 26 19:22:05 2020
  InstallationDate: Installed on 2020-02-25 (1 days ago)
  InstallationMedia: Ubuntu-MATE 20.04 LTS "Focal Fossa" - Alpha amd64 
(20200221)
  Lsusb:
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 003: ID 04f3:0c02 Elan Microelectronics Corp. ELAN:Fingerprint
   Bus 001 Device 002: ID 04f2:b61e Chicony Electronics Co., Ltd Integrated 
Camera
   Bus 001 Device 004: ID 8087:0aaa Intel Corp. 
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: LENOVO 20RR
  ProcFB: 0 i915drmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-14-generic 
root=UUID=94f1e507-a44a-46a8-9163-548d27303afb ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-5.4.0-14-generic N/A
   linux-backports-modules-5.4.0-14-generic  N/A
   linux-firmware                            1.186
  SourcePackage: linux-5.4
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 10/29/2019
  dmi.bios.vendor: LENOVO
  dmi.bios.version: CQCN24WW
  dmi.board.asset.tag: No Asset Tag
  dmi.board.name: LNVNB161216
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0J40697WIN
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Lenovo ThinkBook 13s-IML
  dmi.modalias: 
dmi:bvnLENOVO:bvrCQCN24WW:bd10/29/2019:svnLENOVO:pn20RR:pvrLenovoThinkBook13s-IML:rvnLENOVO:rnLNVNB161216:rvrSDK0J40697WIN:cvnLENOVO:ct10:cvrLenovoThinkBook13s-IML:
  dmi.product.family: ThinkBook 13s-IML
  dmi.product.name: 20RR
  dmi.product.sku: LENOVO_MT_20RR_BU_idea_FM_ThinkBook 13s-IML
  dmi.product.version: Lenovo ThinkBook 13s-IML
  dmi.sys.vendor: LENOVO

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