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[Raymond <1380046@xxxxxxxxxxxxxxxxxx>]

this mean you need to add mute, delay and unmute when this control is
changed by user

Simple mixer control 'Analog Output',0
  Capabilities: enum
  Items: 'Speakers' 'Headphones' 'FP Headphones'
  Item0: 'Speakers'

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https://bugs.launchpad.net/bugs/1380046

Title:
  [AV200 - Xonar STX, playback] Loud pop when switching to headphones

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

Bug description:
  When switching the port to either headphone ports from the speaker
  port there is a loud pop in the headphones. When I am playing music
  through the speakers at 100% volume and then switch, I can hear the
  music at a very loud volume through the headphones for a fraction of a
  second before dropping to the proper headphones volume which is much
  lower. Even if I mute the output before switching ports there is still
  a pop although not nearly as loud.

  I believe this is a driver issue (oxygen/virtuoso). The Essense STX
  uses a relay to switch between the speaker and headphones ports. I am
  guessing the the power for the speaker (line out) port is much higher
  than that used for the headphones port and the drivers need to mute
  the sound at a hardware level before switching to elmininate the pop.
  On Windows when switching to and from speaker and headphones port the
  output would be muted for almost a second as the port was switched so
  there was no pop. On Ubuntu there is no delay when switching ports. I
  have looked at the driver source code and there is an anti_pop_delay
  of 800 milliseconds used on the Xonar init method. I think this same
  delay should probably be added when switching to the headphone ports.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: alsa-base 1.0.25+dfsg-0ubuntu4
  ProcVersionSignature: Ubuntu 3.13.0-37.64-generic 3.13.11.7
  Uname: Linux 3.13.0-37-generic x86_64
  NonfreeKernelModules: fglrx
  ApportVersion: 2.14.1-0ubuntu3.5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC2:  michael   20842 F.... pulseaudio
   /dev/snd/controlC0:  michael   20842 F.... pulseaudio
   /dev/snd/pcmC0D0p:   michael   20842 F...m pulseaudio
   /dev/snd/controlC1:  michael   20842 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Sat Oct 11 22:50:15 2014
  InstallationDate: Installed on 2014-10-07 (3 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  PackageArchitecture: all
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_AlsaPlaybackTest: ALSA playback test through plughw:STX successful
  Symptom_Card: HD Webcam C910 - USB Device 0x46d:0x821
  Symptom_PulsePlaybackTest: PulseAudio playback test successful
  Symptom_Type: None of the above
  Title: [AV200 - Xonar STX, playback] Playback problem
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/20/2013
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 1401
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: P8H77-M PRO
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: Rev X.0x
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1401:bd08/20/2013:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnP8H77-MPRO:rvrRevX.0x:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.name: System Product Name
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer
  --- 
  ApportVersion: 2.14.1-0ubuntu3.5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  michael    2404 F.... pulseaudio
   /dev/snd/controlC2:  michael    2404 F.... pulseaudio
   /dev/snd/controlC1:  michael    2404 F.... pulseaudio
  CurrentDesktop: Unity
  DistroRelease: Ubuntu 14.04
  HibernationDevice: RESUME=UUID=89201542-3d78-4588-9f0f-3725c7c22875
  InstallationDate: Installed on 2014-10-07 (5 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  IwConfig:
   eth0      no wireless extensions.
   
   lo        no wireless extensions.
  MachineType: System manufacturer System Product Name
  NonfreeKernelModules: fglrx
  Package: linux (not installed)
  ProcFB: 0 VESA VGA
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-37-generic root=UUID=fbc05121-3d98-42ce-8073-986171e4b73f ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.13.0-37.64-generic 3.13.11.7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-37-generic N/A
   linux-backports-modules-3.13.0-37-generic  N/A
   linux-firmware                             1.127.7
  RfKill:
   
  Tags:  trusty trusty
  Uname: Linux 3.13.0-37-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 08/20/2013
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 1401
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: P8H77-M PRO
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: Rev X.0x
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1401:bd08/20/2013:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnP8H77-MPRO:rvrRevX.0x:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.name: System Product Name
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer

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