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

[Огнян Цонев]

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

[Raymond (superquad-vortex2)]

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

[Launchpad Janitor (janitor)]

[Expired for alsa-driver (Ubuntu) because there has been no activity for 60 days.]