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[Francisco Cribari <cribari@xxxxxxxxx>]

I found the solution here: http://bartongeorge.net/2015/04/09/4th-gen-
dell-xps-13-developer-edition-available/ : "If dual booting with Windows
8.1 and kernel 4.0 or earlier you will need to cold boot twice into the
OS for audio to work."

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to alsa-driver in Ubuntu.
https://bugs.launchpad.net/bugs/1447767

Title:
  [XPS 13 9343, Intel Broadwell HDMI, Digital Out, HDMI] No sound at all

Status in alsa-driver package in Ubuntu:
  Confirmed

Bug description:
  I installed Ubuntu 15.04 64 bit (desktop editition) on a DELL XPS 13
  notebook (model 9343) and I have no sound at all. Before installing
  Ubuntu I upgraded bios to A03.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: alsa-base 1.0.25+dfsg-0ubuntu4
  ProcVersionSignature: Ubuntu 3.19.0-15.15-generic 3.19.3
  Uname: Linux 3.19.0-15-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.17.2-0ubuntu1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  cribari    1733 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Thu Apr 23 15:46:30 2015
  InstallationDate: Installed on 2015-04-23 (0 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  PackageArchitecture: all
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_AlsaPlaybackTest: ALSA playback test through plughw:HDMI failed
  Symptom_Card: Built-in Audio - HDA Intel HDMI
  Symptom_DevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  cribari    1733 F.... pulseaudio
  Symptom_Jack: Digital Out, HDMI
  Symptom_Type: No sound at all
  Title: [XPS 13 9343, Intel Broadwell HDMI, Digital Out, HDMI] No sound at all
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 03/25/2015
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A03
  dmi.board.name: 0310JH
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA03:bd03/25/2015:svnDellInc.:pnXPS139343:pvr01:rvnDellInc.:rn0310JH:rvrA00:cvnDellInc.:ct9:cvr:
  dmi.product.name: XPS 13 9343
  dmi.product.version: 01
  dmi.sys.vendor: Dell Inc.

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