[Audio Input (mic)] not properly detected

1) The release of Ubuntu you are using, via 'lsb_release -rd' or System -> About Ubuntu
Description: Ubuntu 12.04 LTS
Release: 12.04

2) The version of the package you are using, via 'apt-cache policy pkgname' or by checking in Software Center
gnome-control-center:
  Installiert: 1:3.4.1-0ubuntu1
  Kandidat: 1:3.4.1-0ubuntu1
  Versionstabelle:
 *** 1:3.4.1-0ubuntu1 0
        500 http://archive.ubuntu.com/ubuntu/ precise/main i386 Packages
        100 /var/lib/dpkg/status
pulseaudio:
  Installiert: 1:1.1-0ubuntu15
  Kandidat: 1:1.1-0ubuntu15
  Versionstabelle:
 *** 1:1.1-0ubuntu15 0
        500 http://archive.ubuntu.com/ubuntu/ precise/main i386 Packages
        100 /var/lib/dpkg/status

3) What you expected to happen
If I plug in an external mic the controls of the audio settings should work.

4) What happened instead
I have to close the audio settings and start them again to get the audio controls working.

I have attached a little video that demonstrates the problem.

For further reference please take a look at the following comment:
https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/946232/comments/21

If you need more information please let me know.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: gnome-control-center 1:3.4.1-0ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-24.37-generic-pae 3.2.14
Uname: Linux 3.2.0-24-generic-pae i686
ApportVersion: 2.0.1-0ubuntu7
Architecture: i386
Date: Thu May 3 17:33:40 2012
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta i386 (20120301)
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: gnome-control-center
UpgradeStatus: No upgrade log present (probably fresh install)
usr_lib_gnome-control-center:
 activity-log-manager-control-center 0.9.4-0ubuntu3
 deja-dup 22.0-0ubuntu2
 gnome-bluetooth 3.2.2-0ubuntu5
 indicator-datetime 0.3.94-0ubuntu2