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[Raymond <1354721@xxxxxxxxxxxxxxxxxx>]

it is strange that pulseaudio select your USB audio device as default
sink when there is no volume control

the null autoconfig may be related to modem codec

Codec: Conexant ID 2bfa
Address: 1
MFG Function Id: 0x2 (unsol 1)
Vendor Id: 0x14f12bfa
Subsystem Id: 0x104d0200
Revision Id: 0x90000
Modem Function Group: 0x2

seem driver overwrite some pin setup


Sysfs Files
!!-----------

/sys/class/sound/hwC0D0/init_pin_configs:
0x0a 0x02211030
0x0b 0x400000fb
0x0c 0x21211040
0x0d 0x02a1502e
0x0e 0x50370060
0x0f 0x90171110
0x11 0x21451040
0x13 0x40c000fd
0x14 0x90a71020

/sys/class/sound/hwC0D0/driver_pin_configs:
0x0a 0x03211020
0x0b 0x411111f0
0x0c 0x411111f0
0x0d 0x03a15030
0x0e 0x411111f0
0x0f 0x90170110
0x11 0x411111f0
0x13 0x411111f0
0x14 0x90a7013e

/sys/class/soun

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Touch seeded packages, which is subscribed to alsa-driver in Ubuntu.
https://bugs.launchpad.net/bugs/1354721

Title:
  impossible reproduce files correctly [USB-Audio - io|2, playback]
  Underruns, dropouts or crackling sound

Status in “alsa-driver” package in Ubuntu:
  New

Bug description:
  External audio device ALESIS IO2 Express
  Initially installation it works well.
  as soon as I installed Hidrogen & Audacity started the problems.
  Possibility of net intrusion at system updates
  (Sorry for my english)

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: alsa-base 1.0.25+dfsg-0ubuntu4
  ProcVersionSignature: Ubuntu 3.13.0-32.57-generic 3.13.11.4
  Uname: Linux 3.13.0-32-generic i686
  ApportVersion: 2.14.1-0ubuntu3.3
  Architecture: i386
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  sergi      1953 F.... pulseaudio
   /dev/snd/controlC1:  sergi      1953 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Sat Aug  9 18:22:58 2014
  InstallationDate: Installed on 2014-08-08 (1 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release i386 (20140722.2)
  PackageArchitecture: all
  ProcEnviron:
   LANGUAGE=ca
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=ca_ES.UTF-8
   SHELL=/bin/bash
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_AlsaPlaybackTest: ALSA playback test through plughw:io2 failed
  Symptom_Card: io|2 - io|2
  Symptom_Type: Underruns, dropouts, or "crackling" sound
  Title: [USB-Audio - io|2, playback] Underruns, dropouts or crackling sound
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/17/2006
  dmi.bios.vendor: Phoenix Technologies LTD
  dmi.bios.version: R0170J3
  dmi.board.asset.tag: N/A
  dmi.board.name: VAIO
  dmi.board.vendor: Sony Corporation
  dmi.board.version: N/A
  dmi.chassis.asset.tag: 7R2M000000002a5e9212242842a4
  dmi.chassis.type: 10
  dmi.chassis.vendor: Sony Corporation
  dmi.chassis.version: C3LMSGGQ
  dmi.modalias: dmi:bvnPhoenixTechnologiesLTD:bvrR0170J3:bd08/17/2006:svnSonyCorporation:pnVGN-FE31B:pvrC3LMSGGQ:rvnSonyCorporation:rnVAIO:rvrN/A:cvnSonyCorporation:ct10:cvrC3LMSGGQ:
  dmi.product.name: VGN-FE31B
  dmi.product.version: C3LMSGGQ
  dmi.sys.vendor: Sony Corporation

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