I can see the same thing here. 
No HDMI device can be found in the output devices list, 

My trace from the control center shows that the HDMI ports are
unavailable, this would be why ...

>>>>>>>>>>>>>>>>>>
 SET PROFILES HDMI / DisplayPort 3
 create_ui_device_from_port, direction 1 
 description HDMI / DisplayPort 3 
 origin Built-in Audio 
 port available 0 
 

 SET PROFILES HDMI / DisplayPort 2
 create_ui_device_from_port, direction 1 
 description HDMI / DisplayPort 2 
 origin Built-in Audio 
 port available 0 
 

 SET PROFILES HDMI / DisplayPort
 create_ui_device_from_port, direction 1 
 description HDMI / DisplayPort 
 origin Built-in Audio 
 port available 0 
 

 SET PROFILES Microphone
 create_ui_device_from_port, direction 0 
 description Microphone 
 origin Built-in Audio 
 port available 0 


** Tags added: soundnua

** Changed in: gnome-control-center (Ubuntu)
   Importance: Undecided => Medium

** Changed in: gnome-control-center (Ubuntu)
     Assignee: (unassigned) => Conor Curran (cjcurran)

** Changed in: gnome-control-center (Ubuntu)
     Assignee: Conor Curran (cjcurran) => David Henningsson (diwic)

** Changed in: gnome-control-center (Ubuntu)
       Status: Confirmed => Triaged

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to gnome-control-center in Ubuntu.
https://bugs.launchpad.net/bugs/961286

Title:
  HDMI audio device detected by the system but not listed in Sound
  Settings

Status in “gnome-control-center” package in Ubuntu:
  Triaged

Bug description:
  It is certainly just a graphical matter because using hardinfo, running pacmd 
or trying to switch to HDMI in XBMC works, it's just not listed in System 
Settings -> Sound.
  From the screenshot you can easily verify there is no HDMI output listed.
  This is a regression from Oneiric, which correctly shows all the available 
hardware outputs on the same computer.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: gnome-control-center 1:3.3.92-0ubuntu2
  ProcVersionSignature: Ubuntu 3.2.0-19.30-generic-pae 3.2.11
  Uname: Linux 3.2.0-19-generic-pae i686
  NonfreeKernelModules: nvidia
  ApportVersion: 1.94.1-0ubuntu2
  Architecture: i386
  Date: Wed Mar 21 15:59:43 2012
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha i386 (20120318)
  ProcEnviron:
   TERM=xterm
   LANG=en_US.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 0.9.4-0ubuntu1
   deja-dup                            21.90-0ubuntu1
   gnome-bluetooth                     3.2.2-0ubuntu3
   indicator-datetime                  0.3.91-0ubuntu1

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