*** This bug is a duplicate of bug 864735 ***
    https://bugs.launchpad.net/bugs/864735

Hello Daniel,
I think the HDMI audio was intentionally disabled, adding "radeon.audiio=1" 
into the grub parameter could solve this.
Or you can install the proprietary driver.

** This bug has been marked a duplicate of bug 864735
   [ATI HDMI] HDMI Audio Disabled by Default (since oneiric)

** Description changed:

  CID: 201108-8338
  
  There is no HDMI audio
  
  Steps:
  1. Install 12.04.4, boot to desktop.
  2. Try to play a sound through the HDMI port
  
  Expected result:
  * HDMI audio works fine.
  
  Actual result:
  * No HDMI output source available in Sound Settings
  
  http://www.alsa-
  project.org/db/?f=603c957920d655ff924a950ea3fc5064f63270f2
  
  01:00.1 Audio device [0403]: Advanced Micro Devices, Inc. [AMD/ATI] Cedar 
HDMI Audio [Radeon HD 5400/6300 Series] [1002:aa68]
-       Subsystem: Bitland(ShenZhen) Information Technology Co., Ltd. Device 
[1642:aa68]
-       Flags: bus master, fast devsel, latency 0, IRQ 48
-       Memory at fe640000 (64-bit, non-prefetchable) [size=16K]
-       Capabilities: <access denied>
-       Kernel driver in use: snd_hda_intel
-       Kernel modules: snd-hda-intel
+  Subsystem: Bitland(ShenZhen) Information Technology Co., Ltd. Device 
[1642:aa68]
+  Flags: bus master, fast devsel, latency 0, IRQ 48
+  Memory at fe640000 (64-bit, non-prefetchable) [size=16K]
+  Capabilities: <access denied>
+  Kernel driver in use: snd_hda_intel
+  Kernel modules: snd-hda-intel
+ 
+ WORKAROUND:
+ 1. Adding "radeon.audio=1" into the grub parameter as indicated in bug 864735
+ 2. Or you can install the proprietary driver.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: linux-image-3.11.0-15-generic 3.11.0-15.25~precise1 [modified: 
boot/vmlinuz-3.11.0-15-generic]
  ProcVersionSignature: Ubuntu 3.11.0-15.25~precise1-generic 3.11.10
  Uname: Linux 3.11.0-15-generic x86_64
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 
k3.11.0-15-generic.
  ApportVersion: 2.0.1-0ubuntu17.6
  Architecture: amd64
  AudioDevicesInUse:
-  USER        PID ACCESS COMMAND
-  /dev/snd/controlC1:  ubuntu     1716 F.... pulseaudio
-  /dev/snd/controlC0:  ubuntu     1716 F.... pulseaudio
+  USER        PID ACCESS COMMAND
+  /dev/snd/controlC1:  ubuntu     1716 F.... pulseaudio
+  /dev/snd/controlC0:  ubuntu     1716 F.... pulseaudio
  CRDA: Error: [Errno 2] No such file or directory
  Card0.Amixer.info:
-  Card hw:0 'PCH'/'HDA Intel PCH at 0xfe700000 irq 47'
-    Mixer name : 'Realtek ALC662 rev1'
-    Components : 'HDA:10ec0662,17aa307c,00100101'
-    Controls      : 36
-    Simple ctrls  : 18
+  Card hw:0 'PCH'/'HDA Intel PCH at 0xfe700000 irq 47'
+    Mixer name : 'Realtek ALC662 rev1'
+    Components : 'HDA:10ec0662,17aa307c,00100101'
+    Controls      : 36
+    Simple ctrls  : 18
  Card1.Amixer.info:
-  Card hw:1 'Generic'/'HD-Audio Generic at 0xfe640000 irq 48'
-    Mixer name : 'ATI R6xx HDMI'
-    Components : 'HDA:1002aa01,00aa0100,00100200'
-    Controls      : 7
-    Simple ctrls  : 1
+  Card hw:1 'Generic'/'HD-Audio Generic at 0xfe640000 irq 48'
+    Mixer name : 'ATI R6xx HDMI'
+    Components : 'HDA:1002aa01,00aa0100,00100200'
+    Controls      : 7
+    Simple ctrls  : 1
  Card1.Amixer.values:
-  Simple mixer control 'IEC958',0
-    Capabilities: pswitch pswitch-joined penum
-    Playback channels: Mono
-    Mono: Playback [on]
+  Simple mixer control 'IEC958',0
+    Capabilities: pswitch pswitch-joined penum
+    Playback channels: Mono
+    Mono: Playback [on]
  Date: Mon Mar 31 21:57:56 2014
  HibernationDevice: RESUME=UUID=ab871f11-e346-4694-b52f-879962d2a394
  InstallationMedia: Ubuntu 12.04.4 LTS "Precise Pangolin" - Release amd64 
(20140204)
  IwConfig:
-  eth0      no wireless extensions.
-  
-  lo        no wireless extensions.
+  eth0      no wireless extensions.
+ 
+  lo        no wireless extensions.
  MachineType: LENOVO FFFFFFFFFF
  MarkForUpload: True
  ProcEnviron:
-  TERM=xterm
-  PATH=(custom, no user)
-  LANG=en_US.UTF-8
-  SHELL=/bin/bash
+  TERM=xterm
+  PATH=(custom, no user)
+  LANG=en_US.UTF-8
+  SHELL=/bin/bash
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-15-generic 
root=UUID=24ed35d5-757c-40e7-a1fd-b3e820f89035 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
-  linux-restricted-modules-3.11.0-15-generic N/A
-  linux-backports-modules-3.11.0-15-generic  N/A
-  linux-firmware                             1.79.9
+  linux-restricted-modules-3.11.0-15-generic N/A
+  linux-backports-modules-3.11.0-15-generic  N/A
+  linux-firmware                             1.79.9
  RfKill:
-  
+ 
  SourcePackage: linux-lts-saucy
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 03/11/2011
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 9QKT14AUS
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: To be filled by O.E.M.
  dmi.board.vendor: LENOVO
  dmi.board.version: To be filled by O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: To Be Filled By O.E.M.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: 
dmi:bvnLENOVO:bvr9QKT14AUS:bd03/11/2011:svnLENOVO:pnFFFFFFFFFF:pvrLenovoProduct:rvnLENOVO:rnTobefilledbyO.E.M.:rvrTobefilledbyO.E.M.:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.name: FFFFFFFFFF
  dmi.product.version: Lenovo Product
  dmi.sys.vendor: LENOVO

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https://bugs.launchpad.net/bugs/1300542

Title:
  AMD HDMI Audio [1002:aa68] no HDMI audio output with snd_hda_intel
  driver

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