For the sake of testing, I checked on the latest Impish daily image,
with kernel 5.11.0-18-generic. Same problem. dmesg attached. Alsa and
PulseAudio don't detect any sound card, even though in dmesg we can see:

$ sudo dmesg | grep -i snd
[   26.169850] snd_hda_intel 0000:00:1f.3: DSP detected with PCI 
class/subclass/prog-if info 0x040100
[   26.169858] snd_hda_intel 0000:00:1f.3: Digital mics found on Skylake+ 
platform, using SST driver


$ aplay -l
aplay: device_list:276: no soundcards found...
ubuntu@ubuntu:~$ pactl list cards
ubuntu@ubuntu:~$ pactl list sources
Source #0
        State: SUSPENDED
        Name: auto_null.monitor
        Description: Monitor of Dummy Output
        Driver: module-null-sink.c
        Sample Specification: s16le 2ch 44100Hz
        Channel Map: front-left,front-right
        Owner Module: 13
        Mute: no
        Volume: front-left: 65536 / 100% / 0.00 dB,   front-right: 65536 / 100% 
/ 0.00 dB
                balance 0.00
        Base Volume: 65536 / 100% / 0.00 dB
        Monitor of Sink: auto_null
        Latency: 0 usec, configured 0 usec
        Flags: DECIBEL_VOLUME LATENCY 
        Properties:
                device.description = "Monitor of Dummy Output"
                device.class = "monitor"
                device.icon_name = "audio-input-microphone"
        Formats:
                pcm
ubuntu@ubuntu:~$ pactl list sinks
Sink #0
        State: SUSPENDED
        Name: auto_null
        Description: Dummy Output
        Driver: module-null-sink.c
        Sample Specification: s16le 2ch 44100Hz
        Channel Map: front-left,front-right
        Owner Module: 13
        Mute: no
        Volume: front-left: 65536 / 100% / 0.00 dB,   front-right: 65536 / 100% 
/ 0.00 dB
                balance 0.00
        Base Volume: 65536 / 100% / 0.00 dB
        Monitor Source: auto_null.monitor
        Latency: 0 usec, configured 0 usec
        Flags: DECIBEL_VOLUME LATENCY SET_FORMATS 
        Properties:
                device.description = "Dummy Output"
                device.class = "abstract"
                device.icon_name = "audio-card"
        Formats:
                pcm


** Attachment added: "dmesg_kernel_5.11.0-18-generic.log"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1915117/+attachment/5507056/+files/dmesg_kernel_5.11.0-18-generic.log

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https://bugs.launchpad.net/bugs/1915117

Title:
  [Regression] Audio card [8086:9d71] not detected after upgrade from
  linux 5.4 to 5.8

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Ubuntu version: 20.10 (updated from 20.04)
  Kernel: 5.8.0-41-generic #46-Ubuntu
  Manufacturer: Acer
  Product Name: Swift SF314-54
  BIOS Revision: 1.11

  Audio card: Realtek High Definition Audio
  Multimedia audio controller [0401]: Intel Corporation Sunrise Point-LP HD 
Audio [8086:9d71] (rev 21)

  Summary
  =======

  After upgrading from linux kernel 5.4 to 5.8, there is no more sound
  card available. However, if I select kernel 5.4 in GRUB, the sound
  card is available.

  Steps to reproduce
  ==================

  1. Install 20.04 or 20.10 with a kenel 5.4
  2. Check that sound output works as excepted (Settings > Sound > Output > 
Test)
  3. Check that `alsa-info` command returns information
  4. Upgrade kernel to 5.8

  Expected results
  ================

  Sound output still works.

  Actual results
  ==============

  2. Sound card is available, and sound can be output to the internal speakers.
  4. No more sound card detected (Sound Settings display "Dummy Output" in the 
list of output devices).

  ProblemType: Bug
  DistroRelease: Ubuntu 20.10
  Package: linux-image-5.8.0-41-generic 5.8.0-41.46
  ProcVersionSignature: Ubuntu 5.8.0-41.46-generic 5.8.18
  Uname: Linux 5.8.0-41-generic x86_64
  ApportVersion: 2.20.11-0ubuntu50.5
  Architecture: amd64
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  CasperMD5CheckResult: skip
  CurrentDesktop: ubuntu:GNOME
  Date: Tue Feb  9 14:42:00 2021
  InstallationDate: Installed on 2019-01-20 (751 days ago)
  InstallationMedia: Ubuntu 18.10 "Cosmic Cuttlefish" - Release amd64 
(20181017.3)
  MachineType: Acer Swift SF314-54
  ProcFB: 0 i915drmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.8.0-41-generic 
root=/dev/mapper/ubuntu--vg-root ro quiet splash mem_sleep_default=deep 
vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-5.8.0-41-generic N/A
   linux-backports-modules-5.8.0-41-generic  N/A
   linux-firmware                            1.190.3
  SourcePackage: linux
  UpgradeStatus: Upgraded to groovy on 2021-02-03 (5 days ago)
  dmi.bios.date: 11/21/2018
  dmi.bios.release: 1.11
  dmi.bios.vendor: Insyde Corp.
  dmi.bios.version: V1.11
  dmi.board.name: Strongbow_KL
  dmi.board.vendor: KBL
  dmi.board.version: V1.11
  dmi.chassis.type: 10
  dmi.chassis.vendor: Acer
  dmi.chassis.version: V1.11
  dmi.ec.firmware.release: 1.6
  dmi.modalias: 
dmi:bvnInsydeCorp.:bvrV1.11:bd11/21/2018:br1.11:efr1.6:svnAcer:pnSwiftSF314-54:pvrV1.11:rvnKBL:rnStrongbow_KL:rvrV1.11:cvnAcer:ct10:cvrV1.11:
  dmi.product.family: Swift 3
  dmi.product.name: Swift SF314-54
  dmi.product.sku: 0000000000000000
  dmi.product.version: V1.11
  dmi.sys.vendor: Acer

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