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[Po-Hsu Lin <po-hsu.lin@xxxxxxxxxxxxx>]

I would say it's quite unstable, and I was informed that this could be a
kernel race issue.

After I installed the 3.12 kernel on this system and cold boot into
3.13.0-37 (I forgot to switch to 3.12 on boot) with HDMI cable connected
HDMI audio is now available.

But if you disconnect it, sometimes it won't disappear automatically from Sound settings.
If it's gone, hot-plug can't make the HDMI audio output available again.

Error messages could be found in dmesg:
[   44.038792] HDMI: Unknown ELD version 10

ubuntu@201307-14037:~$ lspci -nnk | grep -i Audio -A2
00:03.0 Audio device [0403]: Intel Corporation Haswell-ULT HD Audio Controller [8086:0a0c] (rev 09)
	Subsystem: Dell Device [1028:0615]
	Kernel driver in use: snd_hda_intel
--
00:1b.0 Audio device [0403]: Intel Corporation 8 Series HD Audio Controller [8086:9c20] (rev 04)
	Subsystem: Dell Device [1028:0615]
	Kernel driver in use: snd_hda_intel


** Attachment added: "dmesg.log"
   https://bugs.launchpad.net/hwe-next/+bug/1383997/+attachment/4241538/+files/dmesg.log

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https://bugs.launchpad.net/bugs/1383997

Title:
  [Dell Vostro 5470] No HDMI audio with 14.04

Status in HWE Next Project:
  New
Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  CID: 201307-14037 Dell Vostro 5470

  There is no HDMI audio output option available when you connect the
  HDMI monitor (with speaker) to this system.

  Verified with cold plug, still no luck.

  However, HDMI audio could be detected with cold plug on 12.04.4 (3.11
  kernel) stock Ubuntu, tested with LiveUSB

  Alsa-info:
  http://www.alsa-project.org/db/?f=8e5ccdaae7aa4b3a05862385b902f824be65f0bd

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-37-generic 3.13.0-37.64
  ProcVersionSignature: Ubuntu 3.13.0-37.64-generic 3.13.11.7
  Uname: Linux 3.13.0-37-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  ubuntu     1589 F.... pulseaudio
   /dev/snd/controlC1:  ubuntu     1589 F.... pulseaudio
  CRDA:
   country TW:
   	(2402 - 2472 @ 40), (3, 27)
   	(5270 - 5330 @ 40), (3, 17), DFS
   	(5735 - 5815 @ 40), (3, 30)
  CurrentDesktop: Unity
  Date: Tue Oct 21 22:44:45 2014
  HibernationDevice: RESUME=UUID=420e55c0-b179-44d6-93d7-82393cdeec68
  InstallationDate: Installed on 2014-10-21 (0 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  MachineType: Dell Inc. Vostro 5470
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-37-generic.efi.signed root=UUID=a975e1af-1e52-4f17-8e69-190b4dc36b48 ro quiet splash
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-37-generic N/A
   linux-backports-modules-3.13.0-37-generic  N/A
   linux-firmware                             1.127.7
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/23/2013
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A01
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: White Tip Mountain
  dmi.board.vendor: Intel Corp.
  dmi.board.version: FAB3
  dmi.chassis.asset.tag: Asset Tag
  dmi.chassis.type: 9
  dmi.chassis.vendor: Intel Corporation
  dmi.chassis.version: 0.1
  dmi.modalias: dmi:bvnDellInc.:bvrA01:bd08/23/2013:svnDellInc.:pnVostro5470:pvr:rvnIntelCorp.:rnWhiteTipMountain:rvrFAB3:cvnIntelCorporation:ct9:cvr0.1:
  dmi.product.name: Vostro 5470
  dmi.sys.vendor: Dell Inc.

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