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[Eric Peterson <atomicpirate+ubuntu@xxxxxxxxx>]

Public bug reported:

I recently hooked up a SB X-Fi Surrount 5.1 Pro external sound card to
my computer. It has a Line-In port which I wanted to use for playing
audio from another computer. I enabled the loopback module like so:

   pactl load-module module-loopback

And although I could then hear sound from Line-In, it was distorted by
static, crackling sounds. I took the advice I found here:

   https://wiki.ubuntu.com/Audio/PositionReporting

Making this change to /etc/pulse/default.pa:

   load-module module-udev-detect tsched=0

After rebooting and again loading the loopback module, the playback was
static-free. As instructed by the above webpage, I'm filing this bug to
track the issue and suggested solution.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: alsa-base 1.0.25+dfsg-0ubuntu1.1
ProcVersionSignature: Ubuntu 3.2.0-77.114-generic 3.2.66
Uname: Linux 3.2.0-77-generic x86_64
NonfreeKernelModules: nvidia
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 2.0.1-0ubuntu17.8
Architecture: amd64
Card0.Amixer.info:
 Card hw:0 'PCH'/'HDA Intel PCH at 0xfa620000 irq 95'
   Mixer name	: 'Realtek ALC898'
   Components	: 'HDA:10ec0899,104384d8,00100003'
   Controls      : 47
   Simple ctrls  : 23
Card1.Amixer.info:
 Card hw:1 'Pro'/'Creative Technology Ltd SB X-Fi Surround 5.1 Pro at usb-0000:00:1d.0-1.3, high '
   Mixer name	: 'USB Mixer'
   Components	: 'USB041e:3237'
   Controls      : 0
   Simple ctrls  : 0
Card1.Amixer.values:
 
Card2.Amixer.info:
 Card hw:2 'NVidia'/'HDA NVidia at 0xfa080000 irq 36'
   Mixer name	: 'Nvidia GPU 16 HDMI/DP'
   Components	: 'HDA:10de0016,10de0101,00100100'
   Controls      : 24
   Simple ctrls  : 4
Date: Tue Mar 17 21:02:47 2015
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta amd64 (20120328)
MarkForUpload: True
PackageArchitecture: all
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: alsa-driver
Symptom: audio
Symptom_AlsaPlaybackTest: ALSA playback test through plughw:Pro successful
Symptom_Card: GF114 HDMI Audio Controller - HDA NVidia
Symptom_PulsePlaybackTest: PulseAudio playback test successful
Symptom_Type: Underruns, dropouts, or "crackling" sound
Title: [USB-Audio - SB X-Fi Surround 5.1 Pro, playback] Underruns, dropouts or crackling sound
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/10/2012
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 1104
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: P9X79 PRO
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: Rev 1.xx
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1104:bd04/10/2012:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnP9X79PRO:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer

** Affects: alsa-driver (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug precise running-unity third-party-packages

-- 
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/1433382

Title:
  [USB-Audio - SB X-Fi Surround 5.1 Pro, playback] Static, crackling
  sounds using module-loopback

Status in alsa-driver package in Ubuntu:
  New

Bug description:
  I recently hooked up a SB X-Fi Surrount 5.1 Pro external sound card to
  my computer. It has a Line-In port which I wanted to use for playing
  audio from another computer. I enabled the loopback module like so:

     pactl load-module module-loopback

  And although I could then hear sound from Line-In, it was distorted by
  static, crackling sounds. I took the advice I found here:

     https://wiki.ubuntu.com/Audio/PositionReporting

  Making this change to /etc/pulse/default.pa:

     load-module module-udev-detect tsched=0

  After rebooting and again loading the loopback module, the playback
  was static-free. As instructed by the above webpage, I'm filing this
  bug to track the issue and suggested solution.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: alsa-base 1.0.25+dfsg-0ubuntu1.1
  ProcVersionSignature: Ubuntu 3.2.0-77.114-generic 3.2.66
  Uname: Linux 3.2.0-77-generic x86_64
  NonfreeKernelModules: nvidia
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 2.0.1-0ubuntu17.8
  Architecture: amd64
  Card0.Amixer.info:
   Card hw:0 'PCH'/'HDA Intel PCH at 0xfa620000 irq 95'
     Mixer name	: 'Realtek ALC898'
     Components	: 'HDA:10ec0899,104384d8,00100003'
     Controls      : 47
     Simple ctrls  : 23
  Card1.Amixer.info:
   Card hw:1 'Pro'/'Creative Technology Ltd SB X-Fi Surround 5.1 Pro at usb-0000:00:1d.0-1.3, high '
     Mixer name	: 'USB Mixer'
     Components	: 'USB041e:3237'
     Controls      : 0
     Simple ctrls  : 0
  Card1.Amixer.values:
   
  Card2.Amixer.info:
   Card hw:2 'NVidia'/'HDA NVidia at 0xfa080000 irq 36'
     Mixer name	: 'Nvidia GPU 16 HDMI/DP'
     Components	: 'HDA:10de0016,10de0101,00100100'
     Controls      : 24
     Simple ctrls  : 4
  Date: Tue Mar 17 21:02:47 2015
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta amd64 (20120328)
  MarkForUpload: True
  PackageArchitecture: all
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_AlsaPlaybackTest: ALSA playback test through plughw:Pro successful
  Symptom_Card: GF114 HDMI Audio Controller - HDA NVidia
  Symptom_PulsePlaybackTest: PulseAudio playback test successful
  Symptom_Type: Underruns, dropouts, or "crackling" sound
  Title: [USB-Audio - SB X-Fi Surround 5.1 Pro, playback] Underruns, dropouts or crackling sound
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/10/2012
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 1104
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: P9X79 PRO
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: Rev 1.xx
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1104:bd04/10/2012:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnP9X79PRO:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.name: System Product Name
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer

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