*** This bug is a duplicate of bug 1002952 ***
    https://bugs.launchpad.net/bugs/1002952

I have the problems described here exactly, but I have this:

$ cat /proc/asound/cards
 0 [PCH            ]: HDA-Intel - HDA Intel PCH
                      HDA Intel PCH at 0xf7620000 irq 61
 1 [P7xx           ]: USB-Audio - Plantronics Savi 7xx
                      Plantronics Plantronics Savi 7xx at usb-0000:00:1d.0-1.2, 
full speed
 2 [NVidia         ]: HDA-Intel - HDA NVidia
                      HDA NVidia at 0xf7080000 irq 17

I added the device to /usr/share/alsa/cards/USB-Audio.conf:

USB-Audio.pcm.iec958_device {
        # "NoiseBlaster 3000" 42

        # The below don't have digital in/out, so prevent them from being 
opened.
        "Blue Snowball" 999
        "Logitech Speaker Lapdesk N700" 999
        "Logitech USB Headset" 999
        "Logitech Web Camera" 999
        "Logitech Wireless Headset" 999
        "Plantronics USB Headset" 999
        "Sennheiser USB headset" 999
        "Plantronics Savi 7xx" 999
}

restarted, and I have the same problem.  I cannot scroll, click windows,
etc.

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https://bugs.launchpad.net/bugs/975941

Title:
  [soundnua]: Spurious "Digital Output S/PDIF" output entry for USB
  headset

Status in “alsa-lib” package in Ubuntu:
  Confirmed
Status in “gnome-control-center” package in Ubuntu:
  Invalid

Bug description:
  I have a Sennheiser USB headset, which in Ubuntu 11.10 is reported
  correctly, once, in the sound settings when I plug it in. However in
  12.04 it is reported twice:

  "Digital Output (S/PDIF)
  Sennheiser USB headset"

  "Speakers
  Sennheiser USB headset"

  Both have a headset icon. Only the "Speaker" entry appears to work
  correctly; when I try to select the "Digital Output (S/PDIF)" entry
  the selection usually immediately jumps to some other entry.

  It's also strange that the icon is a headset, so it appear to
  recognize that it's a headset, yet the label for the working entry is
  "Speakers". I don't think that is correct, it should be "Headphones"
  (as it is for the headphones connector on my motherboard).

  Let me know if you need additional information or if I can help in any
  other way to fix this problem!

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: gnome-control-center 1:3.4.0-0ubuntu4
  ProcVersionSignature: Ubuntu 3.2.0-22.35-generic-pae 3.2.14
  Uname: Linux 3.2.0-22-generic-pae i686
  ApportVersion: 2.0-0ubuntu4
  Architecture: i386
  Date: Sat Apr  7 15:15:40 2012
  ExecutablePath: /usr/bin/gnome-control-center
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha i386 
(20111129.1)
  ProcEnviron:
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: gnome-control-center
  UpgradeStatus: No upgrade log present (probably fresh install)

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