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[hipitihop <1266343@xxxxxxxxxxxxxxxxxx>]

I have finally managed to get this working as follows:

1. /etc/modprobe.d/alsa-base.conf
  a) comment out all references to # options snd-usb-audio index=-2
  b) add lines at end of file
       # Force Sennheiser PC 8
       alias snd-card-3 snd-usb-audio
       options snd-usb-audio index=3 vid=0x1395 pid=0x0025

2. Test by manually loading module `sudo modprobe snd-usb-audio` and
confirm 'aplayl -l' shows card and you can select and test it in sound
settings.

3. Organise to always load this module on boot by adding following line to /etc/modules
    snd-usb-audio

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https://bugs.launchpad.net/bugs/1266343

Title:
  Sennheiser USB headset not listed as device in aplay -l

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

Bug description:
  I have a Sennheiser USB headset model PC 8 USB which when plugged in
  shows in dmesg (see bellow) however the device is not listed via
  "aplay -l" and does not show up as a valid input/output device in
  sound settings or pavucontrol.

  I have installed and updated/upgraded using sudo add-apt-repository
  ppa:ubuntu-audio-dev/ppa

  Kernel: 3.8.0-35-generic #50~precise1-Ubuntu SMP Wed Dec 4 17:25:51 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
  Ubuntu: 12.04.3

  also-info.sh output mentioned on
  https://help.ubuntu.com/community/SoundTroubleshootingProcedure
  posted: http://www.alsa-
  project.org/db/?f=c35e4d07adf0a31647f2c9ddf9f46df75ba6c809

  /usr/share/alsa/cards/USB-Audio.conf here:
  http://paste.ubuntu.com/6700927/

  *** DMESG trace ****
  [ 6393.031441] usb 3-1: new full-speed USB device number 4 using xhci_hcd
  [ 6393.052766] usb 3-1: New USB device found, idVendor=1395, idProduct=0025
  [ 6393.052771] usb 3-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
  [ 6393.052774] usb 3-1: Product: Sennheiser USB headset
  [ 6393.052776] usb 3-1: Manufacturer: Sennheiser Communications 
  [ 6393.053749] input: Sennheiser Communications  Sennheiser USB headset as /devices/pci0000:00/0000:00:14.0/usb3/3-1/3-1:1.3/input/input22
  [ 6393.053929] hid-generic 0003:1395:0025.0008: input,hidraw4: USB HID v1.00 Device [Sennheiser Communications  Sennheiser USB headset] on usb-0000:00:14.0-1/input3

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