Public bug reported:

I no longer seem to be getting audio on my laptop, and only "Dummy
Output" shows up in the sound settings dialog. This sounds similar to LP
#1781294 (including the same PCI device), though that seems to have been
marked expired.

alex@tapada:~$ lspci -v | grep -A7 -i "audio"
00:1f.3 Audio device: Intel Corporation Sunrise Point-LP HD Audio (rev 21) 
(prog-if 80)
        Subsystem: Lenovo Sunrise Point-LP HD Audio
        Flags: bus master, fast devsel, latency 64, IRQ 159
        Memory at 2ffb028000 (64-bit, non-prefetchable) [size=16K]
        Memory at 2ffb000000 (64-bit, non-prefetchable) [size=64K]
        Capabilities: <access denied>
        Kernel driver in use: snd_hda_intel
        Kernel modules: snd_hda_intel, snd_soc_skl

alex@tapada:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 18.04.3 LTS
Release:        18.04
Codename:       bionic

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: alsa-base 1.0.25+dfsg-0ubuntu5
ProcVersionSignature: Ubuntu 5.0.0-37.40~18.04.1-generic 5.0.21
Uname: Linux 5.0.0-37-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.9
Architecture: amd64
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
CurrentDesktop: ubuntu:GNOME
Date: Fri Dec 13 23:38:35 2019
InstallationDate: Installed on 2019-08-31 (104 days ago)
InstallationMedia: Ubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805)
PackageArchitecture: all
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: alsa-driver
Symptom: audio
Title: PCI/internal sound card not detected
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/16/2019
dmi.bios.vendor: LENOVO
dmi.bios.version: N23ET68W (1.43 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20KHCTO1WW
dmi.board.vendor: LENOVO
dmi.board.version: SDK0J40697 WIN
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.modalias: 
dmi:bvnLENOVO:bvrN23ET68W(1.43):bd10/16/2019:svnLENOVO:pn20KHCTO1WW:pvrThinkPadX1Carbon6th:rvnLENOVO:rn20KHCTO1WW:rvrSDK0J40697WIN:cvnLENOVO:ct10:cvrNone:
dmi.product.family: ThinkPad X1 Carbon 6th
dmi.product.name: 20KHCTO1WW
dmi.product.sku: LENOVO_MT_20KH_BU_Think_FM_ThinkPad X1 Carbon 6th
dmi.product.version: ThinkPad X1 Carbon 6th
dmi.sys.vendor: LENOVO
mtime.conffile..etc.modprobe.d.alsa-base.conf: 2019-12-13T22:15:32.867642

** Affects: alsa-driver (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic

-- 
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to alsa-driver in Ubuntu.
https://bugs.launchpad.net/bugs/1856376

Title:
  "Dummy Output" -- built-in audio not detected

Status in alsa-driver package in Ubuntu:
  New

Bug description:
  I no longer seem to be getting audio on my laptop, and only "Dummy
  Output" shows up in the sound settings dialog. This sounds similar to
  LP #1781294 (including the same PCI device), though that seems to have
  been marked expired.

  alex@tapada:~$ lspci -v | grep -A7 -i "audio"
  00:1f.3 Audio device: Intel Corporation Sunrise Point-LP HD Audio (rev 21) 
(prog-if 80)
        Subsystem: Lenovo Sunrise Point-LP HD Audio
        Flags: bus master, fast devsel, latency 64, IRQ 159
        Memory at 2ffb028000 (64-bit, non-prefetchable) [size=16K]
        Memory at 2ffb000000 (64-bit, non-prefetchable) [size=64K]
        Capabilities: <access denied>
        Kernel driver in use: snd_hda_intel
        Kernel modules: snd_hda_intel, snd_soc_skl

  alex@tapada:~$ lsb_release -a
  No LSB modules are available.
  Distributor ID:       Ubuntu
  Description:  Ubuntu 18.04.3 LTS
  Release:      18.04
  Codename:     bionic

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: alsa-base 1.0.25+dfsg-0ubuntu5
  ProcVersionSignature: Ubuntu 5.0.0-37.40~18.04.1-generic 5.0.21
  Uname: Linux 5.0.0-37-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.9
  Architecture: amd64
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  CurrentDesktop: ubuntu:GNOME
  Date: Fri Dec 13 23:38:35 2019
  InstallationDate: Installed on 2019-08-31 (104 days ago)
  InstallationMedia: Ubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 
(20190805)
  PackageArchitecture: all
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: alsa-driver
  Symptom: audio
  Title: PCI/internal sound card not detected
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 10/16/2019
  dmi.bios.vendor: LENOVO
  dmi.bios.version: N23ET68W (1.43 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20KHCTO1WW
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0J40697 WIN
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.modalias: 
dmi:bvnLENOVO:bvrN23ET68W(1.43):bd10/16/2019:svnLENOVO:pn20KHCTO1WW:pvrThinkPadX1Carbon6th:rvnLENOVO:rn20KHCTO1WW:rvrSDK0J40697WIN:cvnLENOVO:ct10:cvrNone:
  dmi.product.family: ThinkPad X1 Carbon 6th
  dmi.product.name: 20KHCTO1WW
  dmi.product.sku: LENOVO_MT_20KH_BU_Think_FM_ThinkPad X1 Carbon 6th
  dmi.product.version: ThinkPad X1 Carbon 6th
  dmi.sys.vendor: LENOVO
  mtime.conffile..etc.modprobe.d.alsa-base.conf: 2019-12-13T22:15:32.867642

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