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[madbiologist <864735@xxxxxxxxxxxxxxxxxx>]

@sergiodavies - You seem to have four DisplayPort monitors connected.
If this is the case, you have a different bug.  Nevertheless, I can
advise here that support for DisplayPort audio on AMD Radeon hardware is
finally available in the upstream Linux 4.0 kernel.

A PPA of the 4.0-rc2 kernel is available at http://kernel.ubuntu.com
/~kernel-ppa/mainline/ and instructions on how to install and uninstall
it are at https://wiki.ubuntu.com/Kernel/MainlineBuilds

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to alsa-driver in Ubuntu.
https://bugs.launchpad.net/bugs/864735

Title:
  [ATI HDMI] HDMI Audio Disabled by Default (since oneiric)

Status in alsa-driver package in Ubuntu:
  Fix Released

Bug description:
  Since kernel 3.0, upstream has disabled audio output for all ATI cards
  in the Radeon driver by default.

  === Workaround 1 ===

  Edit /etc/default/grub and change this line:

  GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

  to this line

  GRUB_CMDLINE_LINUX_DEFAULT="quiet splash radeon.audio=1"

  Now run "sudo update-grub", then reboot your computer.

  === Or workaround 2 ===

  Install the proprietary Catalyst driver.

  ===

  There's no sound at all and videos playback in fast forward when
  outputting through the HDMI controller. This is a regression since it
  worked well in previous releases.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: alsa-base 1.0.24+dfsg-0ubuntu2
  ProcVersionSignature: Ubuntu 3.0.0-12.19-generic-pae 3.0.4
  Uname: Linux 3.0.0-12-generic-pae i686
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 1.23-0ubuntu2
  Architecture: i386
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  melvin     8335 F.... pulseaudio
   /dev/snd/pcmC1D3p:   melvin     8335 F...m pulseaudio
   /dev/snd/controlC0:  melvin     8335 F.... pulseaudio
  Card0.Amixer.info:
   Card hw:0 'SB'/'HDA ATI SB at 0xfe6f4000 irq 16'
     Mixer name	: 'Realtek ALC1200'
     Components	: 'HDA:10ec0888,10ec0888,00100101'
     Controls      : 38
     Simple ctrls  : 21
  Card1.Amixer.info:
   Card hw:1 'HDMI'/'HDA ATI HDMI at 0xfe8e8000 irq 19'
     Mixer name	: 'ATI RS690/780 HDMI'
     Components	: 'HDA:1002791a,00791a00,00100000'
     Controls      : 4
     Simple ctrls  : 1
  Card1.Amixer.values:
   Simple mixer control 'IEC958',0
     Capabilities: pswitch pswitch-joined penum
     Playback channels: Mono
     Mono: Playback [on]
  Date: Sun Oct  2 12:46:40 2011
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Beta i386 (20110929)
  PackageArchitecture: all
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_AlsaPlaybackTest: ALSA playback test through plughw:HDMI failed
  Symptom_Card: RS780 Azalia controller - HDA ATI HDMI
  Symptom_Jack: Digital Out, HDMI
  Symptom_Type: No sound at all
  Title: [GT5676, ATI RS690/780 HDMI, Digital Out, HDMI] No sound at all
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 02/18/2008
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 7B3G1P04
  dmi.board.asset.tag: To Be Filled By O.E.M.
  dmi.board.name: Not Available
  dmi.board.vendor: Gateway
  dmi.board.version: Not Available
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: Gateway
  dmi.chassis.version: 1.0
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr7B3G1P04:bd02/18/2008:svnGateway:pnGT5676:pvr7B3G1P04:rvnGateway:rnNotAvailable:rvrNotAvailable:cvnGateway:ct3:cvr1.0:
  dmi.product.name: GT5676
  dmi.product.version: 7B3G1P04
  dmi.sys.vendor: Gateway

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