Public bug reported:

After plugging my headset into (or unplugging from) the green jack in
front (either immediately or after a few seconds), the sound begins to
crackle on VoIP calls.  This happens both with Skype and Jitsi (SIP
protocol).  Other audio, such as music from Rhythmbox, remains
unaffected.

Workaround: I discovered that the problem goes away immediately upon
adjusting the "Output volume" slider in the "Sound settings"
configuration.  As soon as it's moved left or right, the sounds clears
and reverts to normal.  Muting and unmuting doesn't work; it's actually
necessary to move the slider.

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: alsa-base 1.0.25+dfsg-0ubuntu4
ProcVersionSignature: Ubuntu 3.8.0-25.37-generic 3.8.13
Uname: Linux 3.8.0-25-generic x86_64
ApportVersion: 2.9.2-0ubuntu8.1
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC1:  colan      3576 F.... pulseaudio
 /dev/snd/controlC0:  colan      3576 F.... pulseaudio
 /dev/snd/pcmC0D0c:   colan      3576 F...m pulseaudio
 /dev/snd/pcmC0D0p:   colan      3576 F...m pulseaudio
Date: Fri Jun  7 15:20:19 2013
InstallationDate: Installed on 2010-05-10 (1124 days ago)
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release amd64 (20100427.1)
MarkForUpload: True
PackageArchitecture: all
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_CA.UTF-8
 SHELL=/bin/zsh
SourcePackage: alsa-driver
Symptom: audio
Symptom_Card: Built-in Audio - HDA ATI SB
Symptom_Jack: Green Headphone Out, Front
Symptom_Type: Sound works for a while, then breaks
Title: [To be filled by O.E.M., Realtek ALC889, Green Headphone Out, Front] 
fails after a while
UpgradeStatus: Upgraded to raring on 2013-05-20 (18 days ago)
dmi.bios.date: 10/23/2012
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: FA
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: 990FXA-UD3
dmi.board.vendor: AMD Corporation
dmi.board.version: x.x
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrFA:bd10/23/2012:svnGigabyteTechnologyCo.,Ltd.:pnTobefilledbyO.E.M.:pvrTobefilledbyO.E.M.:rvnAMDCorporation:rn990FXA-UD3:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.name: To be filled by O.E.M.
dmi.product.version: To be filled by O.E.M.
dmi.sys.vendor: Gigabyte Technology Co., Ltd.

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


** Tags: amd64 apport-bug raring

** Description changed:

- After plugging my headset into the green jack in front (either
- immediately or after a few seconds), the sound begins to crackle on VoIP
- calls.  This happens both with Skype and Jitsi (SIP protocol).  Other
- audio, such as music from Rhythmbox, remains unaffected.
+ After plugging my headset into (or unplugging from) the green jack in
+ front (either immediately or after a few seconds), the sound begins to
+ crackle on VoIP calls.  This happens both with Skype and Jitsi (SIP
+ protocol).  Other audio, such as music from Rhythmbox, remains
+ unaffected.
  
  Workaround: I discovered that the problem goes away immediately upon
  adjusting the "Output volume" slider in the "Sound settings"
  configuration.  As soon as it's moved left or right, the sounds clears
  and reverts to normal.  Muting and unmuting doesn't work; it's actually
  necessary to move the slider.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: alsa-base 1.0.25+dfsg-0ubuntu4
  ProcVersionSignature: Ubuntu 3.8.0-25.37-generic 3.8.13
  Uname: Linux 3.8.0-25-generic x86_64
  ApportVersion: 2.9.2-0ubuntu8.1
  Architecture: amd64
  AudioDevicesInUse:
-  USER        PID ACCESS COMMAND
-  /dev/snd/controlC1:  colan      3576 F.... pulseaudio
-  /dev/snd/controlC0:  colan      3576 F.... pulseaudio
-  /dev/snd/pcmC0D0c:   colan      3576 F...m pulseaudio
-  /dev/snd/pcmC0D0p:   colan      3576 F...m pulseaudio
+  USER        PID ACCESS COMMAND
+  /dev/snd/controlC1:  colan      3576 F.... pulseaudio
+  /dev/snd/controlC0:  colan      3576 F.... pulseaudio
+  /dev/snd/pcmC0D0c:   colan      3576 F...m pulseaudio
+  /dev/snd/pcmC0D0p:   colan      3576 F...m pulseaudio
  Date: Fri Jun  7 15:20:19 2013
  InstallationDate: Installed on 2010-05-10 (1124 days ago)
  InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release amd64 (20100427.1)
  MarkForUpload: True
  PackageArchitecture: all
  ProcEnviron:
-  TERM=xterm
-  PATH=(custom, no user)
-  XDG_RUNTIME_DIR=<set>
-  LANG=en_CA.UTF-8
-  SHELL=/bin/zsh
+  TERM=xterm
+  PATH=(custom, no user)
+  XDG_RUNTIME_DIR=<set>
+  LANG=en_CA.UTF-8
+  SHELL=/bin/zsh
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_Card: Built-in Audio - HDA ATI SB
  Symptom_Jack: Green Headphone Out, Front
  Symptom_Type: Sound works for a while, then breaks
  Title: [To be filled by O.E.M., Realtek ALC889, Green Headphone Out, Front] 
fails after a while
  UpgradeStatus: Upgraded to raring on 2013-05-20 (18 days ago)
  dmi.bios.date: 10/23/2012
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: FA
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: 990FXA-UD3
  dmi.board.vendor: AMD Corporation
  dmi.board.version: x.x
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrFA:bd10/23/2012:svnGigabyteTechnologyCo.,Ltd.:pnTobefilledbyO.E.M.:pvrTobefilledbyO.E.M.:rvnAMDCorporation:rn990FXA-UD3:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.name: To be filled by O.E.M.
  dmi.product.version: To be filled by O.E.M.
  dmi.sys.vendor: Gigabyte Technology Co., Ltd.

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https://bugs.launchpad.net/bugs/1188780

Title:
  [Realtek ALC889, Green Headphone Out, Front] crackles immediately or a
  few seconds after (un)plugging

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