The same issue here, on Ubuntu 17.10. Only "Dummy Output" found in
Output window.

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https://bugs.launchpad.net/bugs/1717992

Title:
  Sound silently plays to "Dummy Output"

Status in linux package in Ubuntu:
  Confirmed
Status in pulseaudio package in Ubuntu:
  New

Bug description:
  Since upgrade to 4.10.0-35-generic in Ubuntu 17.04, the sound card is
  detected, but pavucontrol has only "Dummy Output". Bar animation shows
  audio is playing, but no sound is heard. alsamixer is working fine,
  but audio still can't be heard. Configuration tab says "No cards
  available for configuration".

  $ lspci -v
  0:1f.3 Audio device: Intel Corporation Device 9d71 (rev 21)
        Subsystem: Dell Device 0781
        Flags: bus master, fast devsel, latency 32, IRQ 283
        Memory at d5328000 (64-bit, non-prefetchable) [size=16K]
        Memory at d5300000 (64-bit, non-prefetchable) [size=64K]
        Capabilities: <access denied>
        Kernel driver in use: snd_hda_intel
        Kernel modules: snd_hda_intel, snd_soc_skl

  # aplay -L
  default
      Playback/recording through the PulseAudio sound server
  null
      Discard all samples (playback) or generate zero samples (capture)
  pulse
      PulseAudio Sound Server
  sysdefault:CARD=PCH
      HDA Intel PCH, ALC3246 Analog
      Default Audio Device
  front:CARD=PCH,DEV=0
      HDA Intel PCH, ALC3246 Analog
      Front speakers
  surround21:CARD=PCH,DEV=0
      HDA Intel PCH, ALC3246 Analog
      2.1 Surround output to Front and Subwoofer speakers
  surround40:CARD=PCH,DEV=0
      HDA Intel PCH, ALC3246 Analog
      4.0 Surround output to Front and Rear speakers
  surround41:CARD=PCH,DEV=0
      HDA Intel PCH, ALC3246 Analog
      4.1 Surround output to Front, Rear and Subwoofer speakers
  surround50:CARD=PCH,DEV=0
      HDA Intel PCH, ALC3246 Analog
      5.0 Surround output to Front, Center and Rear speakers
  surround51:CARD=PCH,DEV=0
      HDA Intel PCH, ALC3246 Analog
      5.1 Surround output to Front, Center, Rear and Subwoofer speakers
  surround71:CARD=PCH,DEV=0
      HDA Intel PCH, ALC3246 Analog
      7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
  hdmi:CARD=PCH,DEV=0
      HDA Intel PCH, HDMI 0
      HDMI Audio Output
  hdmi:CARD=PCH,DEV=1
      HDA Intel PCH, HDMI 1
      HDMI Audio Output
  hdmi:CARD=PCH,DEV=2
      HDA Intel PCH, HDMI 2
      HDMI Audio Output
  dmix:CARD=PCH,DEV=0
      HDA Intel PCH, ALC3246 Analog
      Direct sample mixing device
  dmix:CARD=PCH,DEV=3
      HDA Intel PCH, HDMI 0
      Direct sample mixing device
  dmix:CARD=PCH,DEV=7
      HDA Intel PCH, HDMI 1
      Direct sample mixing device
  dmix:CARD=PCH,DEV=8
      HDA Intel PCH, HDMI 2
      Direct sample mixing device
  dsnoop:CARD=PCH,DEV=0
      HDA Intel PCH, ALC3246 Analog
      Direct sample snooping device
  dsnoop:CARD=PCH,DEV=3
      HDA Intel PCH, HDMI 0
      Direct sample snooping device
  dsnoop:CARD=PCH,DEV=7
      HDA Intel PCH, HDMI 1
      Direct sample snooping device
  dsnoop:CARD=PCH,DEV=8
      HDA Intel PCH, HDMI 2
      Direct sample snooping device
  hw:CARD=PCH,DEV=0
      HDA Intel PCH, ALC3246 Analog
      Direct hardware device without any conversions
  hw:CARD=PCH,DEV=3
      HDA Intel PCH, HDMI 0
      Direct hardware device without any conversions
  hw:CARD=PCH,DEV=7
      HDA Intel PCH, HDMI 1
      Direct hardware device without any conversions
  hw:CARD=PCH,DEV=8
      HDA Intel PCH, HDMI 2
      Direct hardware device without any conversions
  plughw:CARD=PCH,DEV=0
      HDA Intel PCH, ALC3246 Analog
      Hardware device with all software conversions
  plughw:CARD=PCH,DEV=3
      HDA Intel PCH, HDMI 0
      Hardware device with all software conversions
  plughw:CARD=PCH,DEV=7
      HDA Intel PCH, HDMI 1
      Hardware device with all software conversions
  plughw:CARD=PCH,DEV=8
      HDA Intel PCH, HDMI 2
      Hardware device with all software conversions
  --- 
  ApportVersion: 2.20.4-0ubuntu4.5
  Architecture: amd64
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/dsp', 
'/dev/snd/by-path', '/dev/snd/hwC0D2', '/dev/snd/hwC0D0', '/dev/snd/pcmC0D8p', 
'/dev/snd/pcmC0D7p', '/dev/snd/pcmC0D3p', '/dev/snd/pcmC0D0c', 
'/dev/snd/pcmC0D0p', '/dev/snd/controlC0', '/dev/snd/seq', '/dev/snd/timer'] 
failed with exit code 1:
  CurrentDesktop: XFCE
  DistroRelease: Ubuntu 17.04
  HibernationDevice: RESUME=UUID=0bcd17dc-d971-4048-8c1f-d2bb48e8a157
  InstallationDate: Installed on 2017-08-18 (31 days ago)
  InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
  MachineType: Dell Inc. Inspiron 7460
  NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.10.0-35-generic.efi.signed 
root=/dev/mapper/ubu-root ro quiet splash zswap.enabled=1 vt.handoff=7
  ProcVersionSignature: Ubuntu 4.10.0-35.39-generic 4.10.17
  RelatedPackageVersions:
   linux-restricted-modules-4.10.0-35-generic N/A
   linux-backports-modules-4.10.0-35-generic  N/A
   linux-firmware                             1.164.1
  Tags:  zesty
  Uname: Linux 4.10.0-35-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip docker lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 07/19/2017
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 1.1.6
  dmi.board.name: 0V736W
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A01
  dmi.chassis.type: 10
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: 
dmi:bvnDellInc.:bvr1.1.6:bd07/19/2017:svnDellInc.:pnInspiron7460:pvr:rvnDellInc.:rn0V736W:rvrA01:cvnDellInc.:ct10:cvr:
  dmi.product.name: Inspiron 7460
  dmi.sys.vendor: Dell Inc.

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