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["Christopher M. Penalver" <christopher.m.penalver@xxxxxxxxx>]

Kelvin Middleton, bugzilla is legacy, and not necessarily the final authority. However, it would help immensely if you filed a new report via a terminal:
ubuntu-bug linux

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

Title:
  8086:0412 Intel HDMI Audio not working with IOMMU enabled

Status in The Linux Kernel:
  Unknown
Status in linux package in Ubuntu:
  Incomplete

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

  WORKAROUND: 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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