Public bug reported:

Was working, then it just stopped.  After reboot, no problems.

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: alsa-base 1.0.24+dfsg-0ubuntu1
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic-pae 2.6.38.2
Uname: Linux 2.6.38-8-generic-pae i686
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
Architecture: i386
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: PCH [HDA Intel PCH], device 0: STAC92xx Analog [STAC92xx Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  erahhal    1867 F.... pulseaudio
 /dev/snd/pcmC0D0p:   erahhal    1867 F...m pulseaudio
Card0.Amixer.info:
 Card hw:0 'PCH'/'HDA Intel PCH at 0xc3700000 irq 51'
   Mixer name   : 'Intel CougarPoint HDMI'
   Components   : 'HDA:111d7605,103c1646,00100105 
HDA:80862805,80860101,00100000'
   Controls      : 18
   Simple ctrls  : 10
Date: Thu Jun 16 05:38:08 2011
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=en_US:en
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: alsa-driver
Symptom: audio
Symptom_AlsaPlaybackTest: ALSA playback test through plughw:PCH failed
Symptom_Card: Internal Audio - HDA Intel PCH
Symptom_DevicesInUse: 1867  1867/dev/snd/pcmC0D0p:   erahhal   F...m pulseaudio
Symptom_Jack: Speaker, Internal
Symptom_Type: No sound at all
Title: [HP Pavilion dv4 Notebook PC, IDT 92HD81B1X5, Speaker, Internal] No 
sound at all
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 03/23/2011
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: F.07
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: 1646
dmi.board.vendor: Hewlett-Packard
dmi.board.version: 12.16
dmi.chassis.asset.tag: Chassis Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.chassis.version: Chassis Version
dmi.modalias: 
dmi:bvnHewlett-Packard:bvrF.07:bd03/23/2011:svnHewlett-Packard:pnHPPaviliondv4NotebookPC:pvr059A100000204610001010100:rvnHewlett-Packard:rn1646:rvr12.16:cvnHewlett-Packard:ct10:cvrChassisVersion:
dmi.product.name: HP Pavilion dv4 Notebook PC
dmi.product.version: 059A100000204610001010100
dmi.sys.vendor: Hewlett-Packard

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


** Tags: apport-bug i386 natty

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https://bugs.launchpad.net/bugs/798008

Title:
  [HP Pavilion dv4 Notebook PC, IDT 92HD81B1X5, Speaker, Internal] No
  sound at all

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