Based on https://bugzilla.kernel.org/show_bug.cgi?id=201251#c164, I generated 
the skl_hda_dsp_generic-tplg.bin and put it under /lib/firmware for the Intel 
SST driver. With my own build kernel (SOF and Intel SST all enabled), the dmesg 
shows that the ALC256 been found as down below.
```
[   26.615808] snd_soc_skl 0000:00:1f.3: Direct firmware load for 
9d71-ACRSYS-ACRPRDCT-2-tplg.bin failed with error -2
[   26.615813] snd_soc_skl 0000:00:1f.3: tplg fw 
9d71-ACRSYS-ACRPRDCT-2-tplg.bin load failed with -2, trying alternative tplg 
name skl_hda_dsp_generic-tplg.bin
[   26.630399] snd_soc_skl 0000:00:1f.3: ASoC: Parent card not yet available, 
widget card binding deferred
[   26.687728] debugfs: File 'DMIC01 Rx' in directory 'dapm' already present!
[   26.687997] HDMI HDA Codec ehdaudio0D2: hdac_hdmi_present_sense: disconnect 
for pin:port 5:0
[   26.688224] HDMI HDA Codec ehdaudio0D2: hdac_hdmi_present_sense: disconnect 
for pin:port 6:0
[   26.688434] HDMI HDA Codec ehdaudio0D2: hdac_hdmi_present_sense: disconnect 
for pin:port 7:0
[   26.696721] snd_hda_codec_realtek ehdaudio0D0: autoconfig for ALC256: 
line_outs=1 (0x14/0x0/0x0/0x0/0x0) type:speaker
[   26.696724] snd_hda_codec_realtek ehdaudio0D0:    speaker_outs=0 
(0x0/0x0/0x0/0x0/0x0)
[   26.696726] snd_hda_codec_realtek ehdaudio0D0:    hp_outs=1 
(0x21/0x0/0x0/0x0/0x0)
[   26.696727] snd_hda_codec_realtek ehdaudio0D0:    mono: mono_out=0x0
[   26.696728] snd_hda_codec_realtek ehdaudio0D0:    inputs:
[   26.696729] snd_hda_codec_realtek ehdaudio0D0:      Internal Mic=0x1a
[   26.696730] snd_hda_codec_realtek ehdaudio0D0:      Headset Mic=0x19
```
Now the `aplay -l` and `arecord -l` can show audio interfaces as expected. 
However, the `pactl list sinks`and `pactl list sources` still gives `Dummy` 
devices. Thus the Sound Settings display still show `Dummy Output`. We may need 
to update the pulseausio for this.

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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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