@linden
Same problem here, "usb headset detected (both in the sound settings and by 
lsusb)". Plugged out the headset, killed all pulseaudio and plugged it in and 
bingo! it works.
cheers

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You received this bug notification because you are a member of Desktop
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https://bugs.launchpad.net/bugs/994301

Title:
  usb headphones not working

Status in “alsa-driver” package in Ubuntu:
  Confirmed

Bug description:
  No sound in USB headphones - mic does not work either.  lsusb
  indicated that the system does see the headphones. External speakers
  work fine and continue to work even when USB headphones are plugged
  in.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: alsa-base 1.0.25+dfsg-0ubuntu1
  ProcVersionSignature: Ubuntu 3.2.0-24.37-generic 3.2.14
  Uname: Linux 3.2.0-24-generic x86_64
  NonfreeKernelModules: nvidia
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 2.0.1-0ubuntu7
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  chris      1954 F.... pulseaudio
   /dev/snd/controlC0:  chris      1939 F.... xfce4-volumed
                        chris      1954 F.... pulseaudio
  Card0.Amixer.info:
   Card hw:0 'NVidia'/'HDA NVidia at 0xfe028000 irq 22'
     Mixer name : 'Realtek ALC1200'
     Components : 'HDA:10ec0888,103c2a66,00100101'
     Controls      : 31
     Simple ctrls  : 19
  Card1.Amixer.info:
   Card hw:1 'U0xd8c0x0c'/'USB Device 0xd8c:0x0c at usb-0000:00:02.0-6, full 
speed'
     Mixer name : 'USB Mixer'
     Components : 'USB0d8c:000c'
     Controls      : 7
     Simple ctrls  : 3
  Date: Thu May  3 19:11:12 2012
  InstallationMedia: Xubuntu 12.04 LTS "Precise Pangolin" - Release amd64 
(20120425)
  PackageArchitecture: all
  ProcEnviron:
   LANGUAGE=en_US:en
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: alsa-driver
  Symptom: audio
  Title: USB sound card not detected
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 10/17/2008
  dmi.bios.vendor: Phoenix Technologies, LTD
  dmi.bios.version: 5.19
  dmi.board.name: Acacia
  dmi.board.vendor: PEGATRON CORPORATION
  dmi.board.version: 1.02
  dmi.chassis.type: 3
  dmi.chassis.vendor: Hewlett-Packard
  dmi.chassis.version: Chassis Version
  dmi.modalias: 
dmi:bvnPhoenixTechnologies,LTD:bvr5.19:bd10/17/2008:svnHP-Pavilion:pnNC689AA-ABAs3700y:pvr:rvnPEGATRONCORPORATION:rnAcacia:rvr1.02:cvnHewlett-Packard:ct3:cvrChassisVersion:
  dmi.product.name: NC689AA-ABA s3700y
  dmi.sys.vendor: HP-Pavilion

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