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[Raymond <1346490@xxxxxxxxxxxxxxxxxx>]

you have to ask the graphic driver developer since the graphic driver
have the abillity todisable hdmi audio when bandwidth is not enough

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https://bugs.launchpad.net/bugs/1346490

Title:
  Only audio over HDMI in certain modes

Status in “alsa-driver” package in Ubuntu:
  New

Bug description:
  I've hooked up my computer (Ubuntu server 14.04 LTS) to my receiver
  which in turn is hooked up to my TV.

  The problem is that audio only works on certain modes. For instance,
  if I set the mode to 1080i60 using xrandr, audio works fine. The same
  goes for 1080p25. However, when I increase the framerate on the
  progressive scans on the 1920x1080 resolution the audio switches off.
  E.g. 1080p60 (the preferred mode) shows the video just fine,  but
  there's no audio.

  When the computer is directly connected to the TV I'm able to play
  audio despite using the preferred 1080p60 mode on the built-in TV
  speakers.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: alsa-base 1.0.25+dfsg-0ubuntu4
  ProcVersionSignature: Ubuntu 3.13.0-32.57-generic 3.13.11.4
  Uname: Linux 3.13.0-32-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  dennis     2606 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Mon Jul 21 21:10:27 2014
  InstallationDate: Installed on 2013-01-10 (556 days ago)
  InstallationMedia: Ubuntu-Server 12.04.1 LTS "Precise Pangolin" - Release amd64 (20120817.3)
  PackageArchitecture: all
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_AlsaPlaybackTest: ALSA playback test through plughw:PCH failed
  Symptom_Card: Built-in Audio - HDA Intel PCH
  Symptom_Jack: Digital Out, HDMI
  Symptom_Type: None of the above
  Title: [To be filled by O.E.M., Intel PantherPoint HDMI, Digital Out, HDMI] Playback problem
  UpgradeStatus: Upgraded to trusty on 2014-07-21 (0 days ago)
  dmi.bios.date: 03/23/2012
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: F4
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: B75M-D3H
  dmi.board.vendor: Gigabyte Technology Co., Ltd.
  dmi.board.version: x.x
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrF4:bd03/23/2012:svnGigabyteTechnologyCo.,Ltd.:pnTobefilledbyO.E.M.:pvrTobefilledbyO.E.M.:rvnGigabyteTechnologyCo.,Ltd.:rnB75M-D3H:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.name: To be filled by O.E.M.
  dmi.product.version: To be filled by O.E.M.
  dmi.sys.vendor: Gigabyte Technology Co., Ltd.

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