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[TEN <1169984@xxxxxxxxxxxxxxxxxx>]

http://ubuntuforums.org/showthread.php?t=2236419&p=13117007#post13117007 suggests this may not be entirely resolved yet.
Any hints what to look for in the /var/log/syslog (and/or get into a debug mode) appreciated.

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https://bugs.launchpad.net/bugs/1169984

Title:
  3.8.0-18 HDMI/DisplayPort audio regression: Either oops or opening
  device fails with -ENODEV

Status in Ubuntu Desktop Tests:
  New
Status in Release Notes for Ubuntu:
  Fix Released
Status in “linux” package in Ubuntu:
  Fix Released
Status in “linux” source package in Raring:
  Fix Released

Bug description:
  <Release note text>
   * There are reports of non-functional HDMI audio on various machines, even with proprietary drivers. In some cases analog built-in audio is affected too. Typically the the audio device does not show up in sound settings at all.  ([[https://bugs.launchpad.net/bugs/1169984 | LP: #1169984]]
  </Release note text>

  === Current recommended workaround ===

  Hopefully there'll soon be a proposed kernel to test instead, but if you can't wait, simplest is to:
  https://wiki.ubuntu.com/Audio/UpgradingAlsa/DKMS

  === Alternate workaround ===
  IF you have no intention to use the HDMI audio, blacklisting the HDMI audio module will probably prevent this issue. The following commands should do it:
  echo "blacklist snd-hda-codec-hdmi | sudo tee -a /etc/modprobe.d/blacklisthmdi.conf
  sudo depmod -a
  (Reboot)

  ===

  Sound card is no longer detected in the latest upgrade.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: alsa-base 1.0.25+dfsg-0ubuntu4
  ProcVersionSignature: Ubuntu 3.8.0-18.28-generic 3.8.6
  Uname: Linux 3.8.0-18-generic x86_64
  ApportVersion: 2.9.2-0ubuntu8
  Architecture: amd64
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  Date: Wed Apr 17 11:13:20 2013
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2013-01-01 (106 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Alpha amd64 (20121231)
  MarkForUpload: True
  PackageArchitecture: all
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: alsa-driver
  Symptom: audio
  Title: PCI/internal sound card not detected
  UpgradeStatus: Upgraded to raring on 2013-02-12 (64 days ago)
  dmi.bios.date: 07/27/2012
  dmi.bios.vendor: Insyde Corp.
  dmi.bios.version: 1.20
  dmi.board.asset.tag: Type2 - Board Asset Tag
  dmi.board.name: Type2 - Board Product Name1
  dmi.board.vendor: Type2 - Board Vendor Name1
  dmi.board.version: Type2 - Board Version
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: OEM Chassis Manufacturer
  dmi.chassis.version: OEM Chassis Version
  dmi.modalias: dmi:bvnInsydeCorp.:bvr1.20:bd07/27/2012:svnTOSHIBA:pnSatelliteU845W:pvrPSU5RU-00Q003:rvnType2-BoardVendorName1:rnType2-BoardProductName1:rvrType2-BoardVersion:cvnOEMChassisManufacturer:ct10:cvrOEMChassisVersion:
  dmi.product.name: Satellite U845W
  dmi.product.version: PSU5RU-00Q003
  dmi.sys.vendor: TOSHIBA

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