Public bug reported:

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.

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


** Tags: amd64 apport-bug trusty

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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

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