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[Arnkell Logi Pétursson <logip@xxxxx>]

This affects me too.

I'm using 14.04.3 and the spdif crackles. My kernel is 3.16.0-53-generic
#72~14.04.1-Ubuntu.

I'm using a Asrock Z97 Extreme6 and a new cable. All other audio output
is fine but while getting a bit stream from USB the audio is rather
muted but usable.

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Packages, which is subscribed to alsa-driver in Ubuntu.
https://bugs.launchpad.net/bugs/359361

Title:
  ALSA SPDIF Digital output clipping / crackling during playback

Status in alsa-driver package in Ubuntu:
  Confirmed

Bug description:
  When playing sound in Jaunty out of my HDA Intel SPDIF out, loud
  sounds clip. This is audible because from the strong distortion it
  produces, which I have seen some people characterize as "crackling".
  For example, if I go to system->preferences->sound and play the test
  sound, the sinusoid is audibly clipping. I have all of my sliders in
  alsamixer zeroed except for master (@100) and IEC958 (@100). Note that
  if I turn down the volume of the master and/or the IEC958, the
  clipping is still present---I've gone as low as -21dB (64/100) on both
  sliders simultaneously, and the clipping is still there.

  I looked around for solutions, this sounds similar to my problem:
  https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/285866

  However, as I noted, I've tried reducing my levels, and my PCM mixer
  level is all the way at 0 (-58.50 dB) anyway. Not to mention that
  these are digital outputs, so having them at the 0dB gain position
  (100% for the master and IEC958 sliders) should be fine...

  Yes I am certain it's not my speakers clipping.

  Oddly enough, at one point I was able to get it not to clip in the
  gnome sound settings control by going through some sequence of trying
  different backends (various options for ALSA, for OSS, etc.). I have
  not been able to reliably reproduce the non-clipping, but I will keep
  trying.

  For some reason, I hear the clipping when I listen to music using
  gnome-listen, but not when using Amarok using Xine as the backend.

  Please help me stop the clipping.

  ProblemType: Bug
  Architecture: amd64
  ArecordDevices:
   **** List of CAPTURE Hardware Devices ****
   card 0: Intel [HDA Intel], device 0: AD198x Analog [AD198x Analog]
     Subdevices: 2/2
     Subdevice #0: subdevice #0
     Subdevice #1: subdevice #1
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/dsp', '/dev/snd/controlC0', '/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p', '/dev/snd/pcmC0D1p', '/dev/snd/seq', '/dev/snd/timer', '/dev/sequencer2', '/dev/sequencer'] failed with exit code 1:
  Card0.Amixer.info:
   Card hw:0 'Intel'/'HDA Intel at 0xfe020000 irq 17'
     Mixer name	: 'Analog Devices AD1984'
     Components	: 'HDA:11d41984,17aa20d7,00100400'
     Controls      : 30
     Simple ctrls  : 19
  DistroRelease: Ubuntu 9.04
  Package: alsa-base 1.0.18.dfsg-1ubuntu8
  PackageArchitecture: all
  ProcEnviron:
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: alsa-driver
  Uname: Linux 2.6.28-11-generic x86_64
  --- 
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.21.
  Architecture: amd64
  ArecordDevices:
   **** List of CAPTURE Hardware Devices ****
   card 0: Intel [HDA Intel], device 0: AD198x Analog [AD198x Analog]
     Subdevices: 2/2
     Subdevice #0: subdevice #0
     Subdevice #1: subdevice #1
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  edlarson   1435 F.... pulseaudio
  Card0.Amixer.info:
   Card hw:0 'Intel'/'HDA Intel at 0xfe020000 irq 17'
     Mixer name	: 'Analog Devices AD1984'
     Components	: 'HDA:11d41984,17aa20d7,00100400'
     Controls      : 29
     Simple ctrls  : 18
  Card29.Amixer.info:
   Card hw:29 'ThinkPadEC'/'ThinkPad Console Audio Control at EC reg 0x30, fw 7KHT24WW-1.08'
     Mixer name	: 'ThinkPad EC 7KHT24WW-1.08'
     Components	: ''
     Controls      : 1
     Simple ctrls  : 1
  Card29.Amixer.values:
   Simple mixer control 'Console',0
     Capabilities: pswitch pswitch-joined penum
     Playback channels: Mono
     Mono: Playback [on]
  DistroRelease: Ubuntu 10.04
  InstallationMedia: Ubuntu 10.04 "Lucid Lynx" - Beta amd64 (20100318)
  Package: alsa-driver (not installed)
  ProcEnviron:
   LANG=en_US.utf8
   SHELL=/bin/bash
  ProcVersionSignature: Ubuntu 2.6.32-21.32-generic 2.6.32.11+drm33.2
  Tags: lucid
  Uname: Linux 2.6.32-21-generic x86_64
  UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare
  dmi.bios.date: 11/14/2008
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 7LETC5WW (2.25 )
  dmi.board.name: 7732CTO
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Available
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvr7LETC5WW(2.25):bd11/14/2008:svnLENOVO:pn7732CTO:pvrThinkPadR61:rvnLENOVO:rn7732CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 7732CTO
  dmi.product.version: ThinkPad R61
  dmi.sys.vendor: LENOVO

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