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[sergiodavies <864735@xxxxxxxxxxxxxxxxxx>]

@madbiologist - Thanks for your answer.
No I have 5 of them (display ports from 0 to 4), but actually only the one connected to display port 4 has audio capability - and pulseaudio volume control (pavucontrol) is set accordingly.
Despite the pavucontrol showing audio being sent through the 4th display port, no audio is actually received on the other side.
The setup works with proprietary fglrx drivers, but those drivers have an annoying memory leak bug which fills 4GB of memory in less than one day...

Thanks for the hint on the linux kernel 4.0, I'll look at it, but will
that become available from standard repository for ubuntu Trusty?

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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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