Public bug reported:

Description:    Ubuntu 12.04 LTS
Release:        12.04

gnome-control-center:
  Installed: 1:3.4.1-0ubuntu2
  Candidate: 1:3.4.1-0ubuntu2
  Version table:
 *** 1:3.4.1-0ubuntu2 0
        500 http://archive.ubuntu.com/ubuntu/ precise-updates/main i386 Packages
        100 /var/lib/dpkg/status
     1:3.4.1-0ubuntu1 0
        500 http://archive.ubuntu.com/ubuntu/ precise/main i386 Packages

When connecting a HDMI device, open sound settings, Hardware tab, and choose 
HDMI output profile (previously Stereo Duplex is selected).
It used to work after the update to Precise, but short after it started keeping 
the output ALSO on the laptop (double output).

A workaround seems to be: select IEC958 first, and HDMI afterwards.
The first step produces no audio, the second has only HDMI audio, as expected.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: gnome-control-center 1:3.4.1-0ubuntu2
ProcVersionSignature: Ubuntu 3.2.0-24.37~phc0-generic-pae-phc 3.2.14
Uname: Linux 3.2.0-24-generic-pae-phc i686
NonfreeKernelModules: nvidia
ApportVersion: 2.0.1-0ubuntu7
Architecture: i386
Date: Thu May 24 20:09:47 2012
ExecutablePath: /usr/bin/gnome-control-center
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release i386 (20111012)
SourcePackage: gnome-control-center
UpgradeStatus: Upgraded to precise on 2012-05-16 (8 days ago)
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

** Affects: gnome-control-center (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug i386 precise third-party-packages

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https://bugs.launchpad.net/bugs/1004098

Title:
  Audio redirected to hdmi still outputs also from source speakers

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