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[disco <1525554@xxxxxxxxxxxxxxxxxx>]

ArnauC's solution partially worked for me on my HP ProBook 470 G3. The
noise is still there in it's full duration but it's volume is much
lower, it's barely audible now.

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https://bugs.launchpad.net/bugs/1525554

Title:
  [HP ProBook 470 G3, Intel Skylake HDMI, Digital Out, HDMI] No sound at
  all

Status in alsa-driver package in Ubuntu:
  Confirmed
Status in linux package in Ubuntu:
  Confirmed

Bug description:
  No sound on brand new HP ProBook 470 G3 after installing Ubuntu 14.04
  on headphones or internal speakers.

  Connecting a USB headphone and microphone both work, though.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: alsa-base 1.0.25+dfsg-0ubuntu4
  ProcVersionSignature: Ubuntu 3.19.0-39.44~14.04.1-generic 3.19.8-ckt9
  Uname: Linux 3.19.0-39-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.19
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  ronald     2199 F.... pulseaudio
                        ronald     2513 F.... alsamixer
  CurrentDesktop: Unity
  Date: Sat Dec 12 19:36:01 2015
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2015-12-07 (5 days ago)
  InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
  PackageArchitecture: all
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_AlsaPlaybackTest: ALSA playback test through plughw:PCH failed
  Symptom_Card: Built-in Audio - HDA Intel PCH
  Symptom_DevicesInUse:
   Error: command ['pkexec', 'fuser', '-v', '/dev/snd/by-path', '/dev/snd/hwC0D2', '/dev/snd/pcmC0D7p', '/dev/snd/pcmC0D3p', '/dev/snd/controlC0', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 127: Error executing command as another user: Not authorized
   
   This incident has been reported.
  Symptom_Jack: Digital Out, HDMI
  Symptom_Type: No sound at all
  Title: [HP ProBook 470 G3, Intel Skylake HDMI, Digital Out, HDMI] No sound at all
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 09/30/2015
  dmi.bios.vendor: HP
  dmi.bios.version: N78 Ver. 01.02
  dmi.board.name: 8102
  dmi.board.vendor: HP
  dmi.board.version: KBC Version 16.1F
  dmi.chassis.asset.tag: 5CD54286XY
  dmi.chassis.type: 10
  dmi.chassis.vendor: HP
  dmi.modalias: dmi:bvnHP:bvrN78Ver.01.02:bd09/30/2015:svnHP:pnHPProBook470G3:pvr:rvnHP:rn8102:rvrKBCVersion16.1F:cvnHP:ct10:cvr:
  dmi.product.name: HP ProBook 470 G3
  dmi.sys.vendor: HP

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