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[TEN <1203520@xxxxxxxxxxxxxxxxxx>]

Stable Release Update (SRU) & bug control nomination request:

[Impact] 
Playing sound, opening pavucontrol mixer or hotplugging HDMI sink hard-freezes Ubuntu 12.04 LTS unless module snd_hda_codec_hdmi is blacklisted.
This is neither a workaround nor remedy, as additional digital sound cards would have to be installed (and fine-tuned for delay compensation) to re-establish required functionality thus removed from HDMI.
Similar issue exists in https://bugs.launchpad.net/bugs/1169984 & duplicates, potentially making access to display or even surround amplifier a DoS vector.

[Test Case]
While running speaker-test, VLC, Xine or other sound sources, open pavucontrol or connect another monitor/amplifier combination that is a sound sink with different speaker setup.
Playing sound before and after amplifier is turned on may suffice to reproduce crash, but no 100% trigger has been found yet.

[Regression Potential]
Per https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1169984/comments/124 the bug may actually be the regression.
Current situation is to risk severe crashes (for reasons inscrutable to average users) or lack proper audio (after module blacklisting, which also not feasible for many end users).
Avenue&side effects to potential fix yet to be determined.

[Other Info]
VDR / Home Theater systems presumably have to remain on 12.04 LTS for years.
Proprietary Nvidia driver may be implicated.

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https://bugs.launchpad.net/bugs/1203520

Title:
  10de:1040 snd_hda_codec_hdmi (via pavucontrol or applications playing
  sound) freezes Ubuntu 12.04 LTS

Status in “linux” package in Ubuntu:
  Fix Released

Bug description:
  Ubuntu 12.04 LTS Precise Pangolin freezes most of the time when trying
  to use HDMI audio (in particular from google-talkplugin, mplayer, vdr-
  sxfe, vlc, xine) up to and including the current Kernel 3.2.0-49
  without putting snd_hda_codec_hdmi on the /etc/modprobe.d/blacklist-
  oss.conf (thereby losing sound over the Nvidia outputs).

  Invoking pavucontrol with  snd_hda_codec_hdmi loaded almost always
  results in a crash that makes even Ctrl-Alt-SysRq inaccessible.

  Freezes also occurred with both hw and plughw devices of the Nvidia
  HDMIs under ALSA when pulseaudio had been uninstalled for testing.

  According to
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1173769 #3 there
  is "a kernel issue which most likely is to happen with Nvidia
  graphics", this is also not fixed by using https://code.launchpad.net
  /~ubuntu-audio-dev/+archive/alsa-daily/+files/oem-audio-hda-daily-
  dkms_0.201307180553%7Eprecise1_all.deb according to
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1169984 #16.

  New bug as identified by David Henningsson (diwic) to have different
  causes than https://bugs.launchpad.net/ubuntu-desktop-
  tests/+bug/1169984 at #119 et seq.

  Blacklisting is the supposed fix in https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1181616 and http://lists.debian.org/debian-kernel/2012/05/msg00110.html but not the solution if HDMI audio is needed.
  --- 
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 2.0.1-0ubuntu17.3
  Architecture: i386
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  user       2378 F.... pulseaudio
   /dev/snd/controlC1:  user       2378 F.... pulseaudio
  CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not found.
  Card0.Amixer.info:
   Card hw:0 'Intel'/'HDA Intel at 0xf3120000 irq 45'
     Mixer name	: 'Analog Devices AD1884'
     Components	: 'HDA:11d41884,103c2819,00100100'
     Controls      : 31
     Simple ctrls  : 19
  Card1.Amixer.info:
   Card hw:1 'SAA7134'/'saa7134[0] at 0xf3200000 irq 22'
     Mixer name	: 'SAA7134 Mixer'
     Components	: ''
     Controls      : 6
     Simple ctrls  : 3
  Card2.Amixer.info:
   Card hw:2 'NVidia'/'HDA NVidia at 0xf3000000 irq 17'
     Mixer name	: 'Nvidia ID 1c'
     Components	: 'HDA:10de001c,14628097,00100100'
     Controls      : 0
     Simple ctrls  : 0
  Card2.Amixer.values:
   
  DistroRelease: Ubuntu 12.04
  HibernationDevice: RESUME=UUID=b779581c-49c5-4cca-8cac-3d2b5243b6ee
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release i386 (20120423)
  IwConfig:
   lo        no wireless extensions.
   
   eth0      no wireless extensions.
  MachineType: Hewlett-Packard HP Compaq dc7800p Convertible Minitower
  MarkForUpload: True
  NonfreeKernelModules: nvidia
  Package: linux (not installed)
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 VESA VGA
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.2.0-48-generic-pae root=UUID=967f80d1-798e-4c04-bb4c-935f35d7397b ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.2.0-48.74-generic-pae 3.2.46
  RelatedPackageVersions:
   linux-restricted-modules-3.2.0-48-generic-pae N/A
   linux-backports-modules-3.2.0-48-generic-pae  N/A
   linux-firmware                                1.79.4
  RfKill:
   0: hci0: Bluetooth
   	Soft blocked: no
   	Hard blocked: no
  StagingDrivers: mei
  Tags:  precise staging
  Uname: Linux 3.2.0-48-generic-pae i686
  UnreportableReason: Your home partition has less than 3 MB of free space available, which leads to problems using applications and installing updates. Please free some space.
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  dmi.bios.date: 07/18/2007
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: 786F1 v01.04
  dmi.board.asset.tag: CZC8277VRK
  dmi.board.name: 0AACh
  dmi.board.vendor: Hewlett-Packard
  dmi.chassis.asset.tag: CZC8277VRK
  dmi.chassis.type: 6
  dmi.chassis.vendor: Hewlett-Packard
  dmi.modalias: dmi:bvnHewlett-Packard:bvr786F1v01.04:bd07/18/2007:svnHewlett-Packard:pnHPCompaqdc7800pConvertibleMinitower:pvr:rvnHewlett-Packard:rn0AACh:rvr:cvnHewlett-Packard:ct6:cvr:
  dmi.product.name: HP Compaq dc7800p Convertible Minitower
  dmi.sys.vendor: Hewlett-Packard

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