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[Raymond <1513169@xxxxxxxxxxxxxxxxxx>]

https://bugs.freedesktop.org/enter_bug.cgi?product=PulseAudio

you need to file upstream bug report

http://cgit.freedesktop.org/pulseaudio/pulseaudio/tree/src/modules/alsa/mixer/paths
/analog-output.conf

try add

 [Element iAP Interface]
switch = mute
volume = merge

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https://bugs.launchpad.net/bugs/1513169

Title:
  [USB-Audio - MDR-1ADAC, playback] volume muting problem.

Status in alsa-driver package in Ubuntu:
  New

Bug description:
  My device is getting muted every time I plug it in. It's muted in ALSA - the ALSA mixer is the only place I can unmute it. 
  In alsamixer Card: MDR-1ADAC, Chip: USB Mixer, there I see 2 items - iAP interface and iAP interface 1. I need to unmute both, to be able to hear the audio.
  This is real inconvenience now, however it was a big problem until I discovered that the device is just muted, and still working. 
  This behaviour is sins my last update on 2015-11-2 before that the device was working properly every time, no unmuting was ever required.

  Here is what I found about that:
  In /var/lib/alsa/asound.state  I have this about the device
  state.MDR1ADAC {
  	control.1 {
  		iface PCM
  		name 'Playback Channel Map'
  		value.0 0
  		value.1 0
  		comment {
  			access read
  			type INTEGER
  			count 2
  			range '0 - 36'
  		}
  	}
  	control.2 {
  		iface MIXER
  		name 'iAP Interface Playback Switch'
  		value.0 false
  		value.1 false
  		comment {
  			access 'read write'
  			type BOOLEAN
  			count 2
  		}
  	}
  	control.3 {
  		iface MIXER
  		name 'iAP Interface Playback Switch'
  		index 1
  		value false
  		comment {
  			access 'read write'
  			type BOOLEAN
  			count 1
  		}
  	}
  	control.4 {
  		iface MIXER
  		name 'iAP Interface Playback Volume'
  		value.0 127
  		value.1 127
  		comment {
  			access 'read write'
  			type INTEGER
  			count 2
  			range '0 - 127'
  			dbmin -12700
  			dbmax 0
  			dbvalue.0 0
  			dbvalue.1 0
  		}
  	}
  	control.5 {
  		iface MIXER
  		name 'iAP Interface Playback Volume'
  		index 1
  		value 127
  		comment {
  			access 'read write'
  			type INTEGER
  			count 1
  			range '0 - 127'
  			dbmin -12700
  			dbmax 0
  			dbvalue.0 0
  		}
  	}
  }

  
  for control.2 I change the values to true
  value.0 true
  value.1 true
  and then for control.3 I change the value to true. 

  After this changes the USB device is no longer muted when I pluged it
  in. And this solves my issue for now.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: alsa-base 1.0.25+dfsg-0ubuntu4
  ProcVersionSignature: Ubuntu 3.13.0-66.108-generic 3.13.11-ckt27
  Uname: Linux 3.13.0-66-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.18
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Wed Nov  4 19:26:20 2015
  InstallationDate: Installed on 2012-09-24 (1136 days ago)
  InstallationMedia: Ubuntu 12.04.1 LTS "Precise Pangolin" - Release amd64 (20120823.1)
  PackageArchitecture: all
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_Card: MDR-1ADAC - MDR-1ADAC
  Symptom_Type: Volume slider, or mixer problems
  Title: [USB-Audio - MDR-1ADAC, playback] volume slider problem
  UpgradeStatus: Upgraded to trusty on 2014-06-23 (499 days ago)
  dmi.bios.date: 08/21/2012
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: F7
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: H77-DS3H
  dmi.board.vendor: Gigabyte Technology Co., Ltd.
  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.:bvrF7:bd08/21/2012:svnGigabyteTechnologyCo.,Ltd.:pnTobefilledbyO.E.M.:pvrTobefilledbyO.E.M.:rvnGigabyteTechnologyCo.,Ltd.:rnH77-DS3H: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.
  modified.conffile..etc.modprobe.d.alsa.base.conf: [modified]
  mtime.conffile..etc.modprobe.d.alsa.base.conf: 2015-11-04T19:04:31.832056

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