Public bug reported:

May be similar/related to #930617 as very similar symptoms are observed.

If sound output is set to internal (i.e. the headphone jack or speakers)
everything is fine. All videos play as they should

if output is changed to hdmi audio out (i.e. connecting to a display)
all videos (online and offline that worked before) play at 3X speed with
no sound.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: alsa-base 1.0.25+dfsg-0ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-36.57-generic-pae 3.2.35
Uname: Linux 3.2.0-36-generic-pae i686
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 2.0.1-0ubuntu17.1
Architecture: i386
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: ALC262 Analog [ALC262 Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC1:  anton     24911 F.... pulseaudio
 /dev/snd/controlC0:  anton     24911 F.... pulseaudio
 /dev/snd/pcmC0D0p:   anton     24911 F...m pulseaudio
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xd4a00000 irq 48'
   Mixer name   : 'Realtek ALC262'
   Components   : 'HDA:10ec0262,104d3a00,00100302 
HDA:14f12c06,104d1700,00100000'
   Controls      : 18
   Simple ctrls  : 10
Card1.Amixer.info:
 Card hw:1 'HDMI'/'HDA ATI HDMI at 0xd0030000 irq 49'
   Mixer name   : 'ATI R6xx HDMI'
   Components   : 'HDA:1002aa01,104d3a00,00100100'
   Controls      : 6
   Simple ctrls  : 1
Card1.Amixer.values:
 Simple mixer control 'IEC958',0
   Capabilities: pswitch pswitch-joined penum
   Playback channels: Mono
   Mono: Playback [on]
Date: Sat Jan 19 14:14:30 2013
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release i386 
(20120423.2)
MarkForUpload: True
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=en_GB:en
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SourcePackage: alsa-driver
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/27/2009
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: R0180Y4
dmi.board.asset.tag: N/A
dmi.board.name: VAIO
dmi.board.vendor: Sony Corporation
dmi.board.version: N/A
dmi.chassis.asset.tag: N/A
dmi.chassis.type: 10
dmi.chassis.vendor: Sony Corporation
dmi.chassis.version: N/A
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrR0180Y4:bd08/27/2009:svnSonyCorporation:pnVGN-NW11S_T:pvrC601PLF4:rvnSonyCorporation:rnVAIO:rvrN/A:cvnSonyCorporation:ct10:cvrN/A:
dmi.product.name: VGN-NW11S_T
dmi.product.version: C601PLF4
dmi.sys.vendor: Sony Corporation

** Affects: alsa-driver (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug i386 precise third-party-packages

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https://bugs.launchpad.net/bugs/1101796

Title:
  All videos play at 3X speed if audio output set to hdmi

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