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[ArnauC <arnau.colominas@xxxxxxxx>]

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https://bugs.launchpad.net/bugs/1536948

Title:
  [Solved!][HP ProBook 430 G3, Conexant CX20724, Speaker, Internal]
  Underruns, dropouts or crackling sound

Status in alsa-driver package in Ubuntu:
  New

Bug description:
  Hi!

  I have Ubuntu 14.04 LTS with kernel 3.19.0-25 installed in a HP Probook 430 G3. When I finished the installation, the sound doesn't works.
  I followed the Andy C instructions and it works. I didn't use the alsa_setup.sh script.
     -I only put this lines in /etc/modprobe.d/alsa-base.conf
          options snd-hda-intel single_cmd=1
          options snd-hda-intel probe_mask=1
          options snd-hda-intel model=basic

  But when I reboot the laptop (not halt or poweroff), before Ubuntu boots, a very strong noise appears. At every reboot this noise appears.
      -I corrected this problem, I just put the next line in /etc/modprobe.d/alsa-base.conf
           options snd-hda-intel power_save=0

  Now, I've updated the kernel to 3.19.0-47 and the strong noise appears again.
  I've tried to solve adding another option to the file:
          options snd-hda-intel power_save_controller=N
  But doesn't works....

  I've read the kernel documentation pages about ALSA but I haven't find the solution
  https://www.kernel.org/doc/Documentation/sound/alsa/ALSA-Configuration.txt
  https://www.kernel.org/doc/Documentation/sound/alsa/HD-Audio.txt

  
  Has someone got an idea to resolve this issue?
  Thanks to all!

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: alsa-base 1.0.25+dfsg-0ubuntu4
  ProcVersionSignature: Ubuntu 3.19.0-47.53~14.04.1-generic 3.19.8-ckt10
  Uname: Linux 3.19.0-47-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.19
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/pcmC0D0c:   ois        2103 F...m pulseaudio
   /dev/snd/controlC0:  ois        2103 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Fri Jan 22 09:07:39 2016
  InstallationDate: Installed on 2016-01-19 (2 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 successful
  Symptom_Card: Audio intern - HDA Intel PCH
  Symptom_Jack: Speaker, Internal
  Symptom_PulsePlaybackTest: PulseAudio playback test successful
  Symptom_Type: Underruns, dropouts, or "crackling" sound
  Title: [HP ProBook 430 G3, Conexant CX20724, Speaker, Internal] Underruns, dropouts or crackling sound
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 12/02/2015
  dmi.bios.vendor: HP
  dmi.bios.version: N78 Ver. 01.05
  dmi.board.name: 80FF
  dmi.board.vendor: HP
  dmi.board.version: KBC Version 16.20
  dmi.chassis.asset.tag: 5CD5506QNQ
  dmi.chassis.type: 10
  dmi.chassis.vendor: HP
  dmi.modalias: dmi:bvnHP:bvrN78Ver.01.05:bd12/02/2015:svnHP:pnHPProBook430G3:pvr:rvnHP:rn80FF:rvrKBCVersion16.20:cvnHP:ct10:cvr:
  dmi.product.name: HP ProBook 430 G3
  dmi.sys.vendor: HP
  mtime.conffile..etc.modprobe.d.alsa.base.conf: 2016-01-21T13:04:51.249897

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