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[Richard Turner <turnerr@xxxxxxxxxxxx>]

I was finally able to get the sound to work by enabling the SPO switch
within alsamixer.

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https://bugs.launchpad.net/bugs/1527825

Title:
  Dell Latitude 7350 - Audio Broken

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  On a 7350 with Ubuntu 15.04 there is no sound. The results of aplay
  are the following:

  **** List of PLAYBACK Hardware Devices ****
  card 0: HDMI [HDA Intel HDMI], device 3: HDMI 0 [HDMI 0]
    Subdevices: 1/1
    Subdevice #0: subdevice #0
  card 0: HDMI [HDA Intel HDMI], device 7: HDMI 1 [HDMI 1]
    Subdevices: 1/1
    Subdevice #0: subdevice #0
  card 0: HDMI [HDA Intel HDMI], device 8: HDMI 2 [HDMI 2]
    Subdevices: 1/1
    Subdevice #0: subdevice #0

  When looking in dmesg I receive the following:

  sst-acpi INT3438:00: No matching ASoC machine driver found

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: linux-image-3.19.0-15-generic 3.19.0-15.15 [modified: boot/vmlinuz-3.19.0-15-generic]
  ProcVersionSignature: Ubuntu 3.19.0-15.15-generic 3.19.3
  Uname: Linux 3.19.0-15-generic x86_64
  ApportVersion: 2.17.2-0ubuntu1.8
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  user       1217 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Fri Dec 18 23:20:57 2015
  HibernationDevice: RESUME=UUID=3dc87a64-48bc-467b-848e-68c10d6e1791
  InstallationDate: Installed on 2015-12-19 (0 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  MachineType: Dell Inc. Latitude 7350
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-15-generic root=UUID=eb4e1a85-48f2-4cfb-ba10-8db93f6fb225 ro quiet splash acpi_backlight=vendor "acpi_osi=!Windows 2013" "acpi_osi=!Windows 2012GRUB_CMDLINE_LINUX=" vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.19.0-15-generic N/A
   linux-backports-modules-3.19.0-15-generic  N/A
   linux-firmware                             1.143.7
  SourcePackage: linux
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 12/16/2014
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A03
  dmi.board.name: 0M5W75
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA03:bd12/16/2014:svnDellInc.:pnLatitude7350:pvr01:rvnDellInc.:rn0M5W75:rvrA00:cvnDellInc.:ct8:cvr:
  dmi.product.name: Latitude 7350
  dmi.product.version: 01
  dmi.sys.vendor: Dell Inc.

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