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[Alexander Klauer <1534929@xxxxxxxxxxxxxxxxxx>]

I specified ignore_DB=1 in /etc/pulse/{system,default}.pa, and get the
following:

Feb 14 11:36:30 erz pulseaudio[3406]: [pulseaudio] module-udev-detect.c: Failed to parse module arguments
Feb 14 11:36:30 erz pulseaudio[3406]: [pulseaudio] module.c: Failed to load module "module-udev-detect" (argument: "ignore_DB=1"): initialization failed.
Feb 14 11:36:30 erz pulseaudio[3406]: [pulseaudio] main.c: Module load failed.
Feb 14 11:36:30 erz pulseaudio[3406]: [pulseaudio] main.c: Failed to initialize daemon.
Feb 14 11:36:30 erz pulseaudio[3403]: [pulseaudio] main.c: Daemon startup failed.

I guess the patch hasn't made it yet into 14.04, which seems strange
since it's from 2009. I'll try rebuilding pulseaudio.

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https://bugs.launchpad.net/bugs/1534929

Title:
  [USB-Audio - USB PnP Sound Device, playback] volume slider problem:
  USB headset playback suddenly drops to inaudible when volume is set
  below a certain level

Status in alsa-driver package in Ubuntu:
  Incomplete

Bug description:
  With this headset:

  [ 9922.706941] usb 1-1.4: new full-speed USB device number 4 using ehci-pci
  [ 9922.805274] usb 1-1.4: New USB device found, idVendor=1ea7, idProduct=0055
  [ 9922.805279] usb 1-1.4: New USB device strings: Mfr=1, Product=2, SerialNumber=0
  [ 9922.805282] usb 1-1.4: Product: USB PnP Sound Device
  [ 9922.805284] usb 1-1.4: Manufacturer: C-Media Electronics Inc.      
  [ 9922.806688] input: C-Media Electronics Inc.       USB PnP Sound Device as /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.4/1-1.4:1.3/input/input12
  [ 9922.806802] hid-generic 0003:1EA7:0055.0002: input,hidraw1: USB HID v1.00 Device [C-Media Electronics Inc.       USB PnP Sound Device] on usb-0000:00:1a.0-1.4/input3
  [ 9922.872746] usbcore: registered new interface driver snd-usb-audio

  called "CSL Stormrider Wired Headset", playback becomes suddenly
  inaudible when the volume slider in the unity sound preferences
  (accessed via indicator → loudspeaker icon → sound settings) is set to
  below circa 40 %. Setting to above ~40 % restores playback volume to
  what you would expect.

  In alsamixer, the same problem occurs when going from volume level 02
  to volume level 01. At alsamixer level 02, the volume is about what
  you would expect when setting a volume slider to about 40 %.

  This is annoying since 40 % can already be rather loud.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: alsa-base 1.0.25+dfsg-0ubuntu4
  ProcVersionSignature: Ubuntu 3.13.0-74.118-generic 3.13.11-ckt30
  Uname: Linux 3.13.0-74-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.19
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Sat Jan 16 14:25:15 2016
  PackageArchitecture: all
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_Card: Integrated Rate Matching Hub - USB PnP Sound Device
  Symptom_Type: Volume slider, or mixer problems
  Title: [USB-Audio - USB PnP Sound Device, playback] volume slider problem
  UpgradeStatus: Upgraded to trusty on 2014-05-24 (602 days ago)
  dmi.bios.date: 12/10/2012
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: P1.60
  dmi.board.name: B75 Pro3
  dmi.board.vendor: ASRock
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: To Be Filled By O.E.M.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrP1.60:bd12/10/2012:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnB75Pro3:rvr:cvnToBeFilledByO.E.M.: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: To Be Filled By O.E.M.

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