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[Andreas Egli <1223840@xxxxxxxxxxxxxxxxxx>]

I just tested the current raring kernel (3.8.0-30) which exhibits the
same behavior.  Therefore I would say that it is not a regression.

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https://bugs.launchpad.net/bugs/1223840

Title:
  Intel HDMI Audio not working with IOMMU enabled

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  I am using Ubuntu Saucy Development Branch and I noticed that the HDMI
  audio output of the intel graphics stops working if the IOMMU is
  enabled with the kernel boot parameter intel_iommu=on. I need the
  IOMMU to pass an ATI graphics card to a qemu virtual machine.

  My hardware consists of an ASUS Sabertooth Z87 mainboard with an Intel
  i7 4770 cpu (Haswell).

  The HDMI output is detected and displayed correctly but no sound can
  be heard. If the IOMMU is disabled, everything works fine.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: linux-image-3.11.0-7-generic 3.11.0-7.13
  ProcVersionSignature: Ubuntu 3.11.0-7.13-generic 3.11.0
  Uname: Linux 3.11.0-7-generic x86_64
  ApportVersion: 2.12.1-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  htpc       2602 F.... pulseaudio
   /dev/snd/controlC0:  htpc       2602 F.... pulseaudio
  Date: Wed Sep 11 14:00:38 2013
  InstallationDate: Installed on 2013-07-19 (54 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
  IwConfig:
   br0       no wireless extensions.
   
   eth2      no wireless extensions.
   
   lo        no wireless extensions.
  MachineType: ASUS All Series
  MarkForUpload: True
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.11.0-7-generic root=/dev/mapper/local_system-linux ro quiet splash intel_iommu=on pcie_acs_override=downstream vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.11.0-7-generic N/A
   linux-backports-modules-3.11.0-7-generic  N/A
   linux-firmware                            1.113
  RfKill:
   
  SourcePackage: linux
  UpgradeStatus: Upgraded to saucy on 2013-07-22 (50 days ago)
  dmi.bios.date: 08/19/2013
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 1405
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: SABERTOOTH Z87
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: Rev 1.xx
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1405:bd08/19/2013:svnASUS:pnAllSeries:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnSABERTOOTHZ87:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.name: All Series
  dmi.product.version: System Version
  dmi.sys.vendor: ASUS

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