Public bug reported:

When I connect an audio device using USB, I can only use it to play back
stereo sound. Anything else is not detected. I tried it with two
different devices and they both give me the same result. Neither in KDE
nor in Google Hangouts, I can use my microphone. It does not show up as
a selectable input device anywhere.

ALSA does seem to correctly detect that these USB devices have a
microphone.

The microphone of my internal audio does work.

Ubuntu release is 14.04
Package version of Pulseaudio is 1:4.0-0ubuntu11

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: pulseaudio 1:4.0-0ubuntu11
ProcVersionSignature: Ubuntu 3.13.0-27.50-generic 3.13.11
Uname: Linux 3.13.0-27-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.2
Architecture: amd64
CurrentDesktop: KDE
Date: Sun Jun  1 01:13:50 2014
SourcePackage: pulseaudio
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/08/2008
dmi.bios.version: 1.04
dmi.board.name: JHL91
dmi.board.version: REFERENCE
dmi.chassis.type: 1
dmi.chassis.version: N/A
dmi.modalias: 
dmi:bvn:bvr1.04:bd07/08/2008:svn:pn:pvr:rvn:rnJHL91:rvrREFERENCE:cvn:ct1:cvrN/A:

** Affects: pulseaudio (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug trusty

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https://bugs.launchpad.net/bugs/1325282

Title:
  USB microphone inputs not detected by Pulseaudio on Kubuntu Trusty

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