I've seen posting the original post, I've upgrade to Ubuntu 16.04.1
problem is still the same with the HDMI sound. Same problems with the
mixer at double ZERO and unable to adjust volume.

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https://bugs.launchpad.net/bugs/1598303

Title:
  No HDMI sound with ATI Radeon HD 8570D & Asus VS238H-P Monitor

Status in alsa-driver package in Ubuntu:
  New

Bug description:
  As stated I've got a ATI Radeon HD 8570D video card with HDMI port.
  The video part works fine but the audio does not function. The monitor
  volume is turned up to 100%. Alsamixer shows 00 and unadjustable for
  the volume control for this port. This is a Asus A78M-A motherboard
  with a AMD A8-6600K APU with Radeon(tm) HD Graphics.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: alsa-base 1.0.25+dfsg-0ubuntu4
  ProcVersionSignature: Ubuntu 4.2.0-41.48~14.04.1-generic 4.2.8-ckt11
  Uname: Linux 4.2.0-41-generic x86_64
  NonfreeKernelModules: fglrx
  ApportVersion: 2.14.1-0ubuntu3.21
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  michael    2148 F.... pulseaudio
   /dev/snd/pcmC1D0p:   michael    2148 F...m pulseaudio
   /dev/snd/controlC1:  michael    2148 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Fri Jul  1 15:03:53 2016
  InstallationDate: Installed on 2016-06-12 (19 days ago)
  InstallationMedia: Ubuntu 14.04.4 LTS "Trusty Tahr" - Release amd64 
(20160217.1)
  PackageArchitecture: all
  SourcePackage: alsa-driver
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 12/05/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 1204
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: A78M-A
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: Rev X.0x
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr1204:bd12/05/2014:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnA78M-A:rvrRevX.0x:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.name: System Product Name
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer

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