Sound doesn't work randomly. [700Z3A/700Z4A/700Z5A/700Z5B, Realtek ALC269VC, Speaker, Internal] No sound at all

Sometimes audio randomly stops working. It's happened 3 times now, and requires a restart to fix.
It seems like it happens when I put my headphones into the audio jack, but this could just be correlation, rather than causation, as I put my headphones in when I'm trying to listen to audio.

Sound doesn't work for both my headphones, and my internal speakers when this happens, and the right audio device is selected.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: alsa-base 1.0.25+dfsg-0ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-26.41-generic 3.2.19
Uname: Linux 3.2.0-26-generic x86_64
NonfreeKernelModules: fglrx
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 2.0.1-0ubuntu8
Architecture: amd64
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: PCH [HDA Intel PCH], device 0: ALC269VC Analog [ALC269VC Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: ryan 4164 F.... pulseaudio
 /dev/snd/pcmC0D0p: ryan 4164 F...m pulseaudio
Card0.Amixer.info:
 Card hw:0 'PCH'/'HDA Intel PCH at 0xc0800000 irq 54'
   Mixer name : 'Intel CougarPoint HDMI'
   Components : 'HDA:10ec0269,144dc0b3,00100202 HDA:80862805,80860101,00100000'
   Controls : 25
   Simple ctrls : 12
Date: Mon Jul 2 14:17:45 2012
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
PackageArchitecture: all
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: alsa-driver
Symptom: audio
Symptom_AlsaPlaybackTest: ALSA playback test through plughw:PCH failed
Symptom_Card: Built-in Audio - HDA Intel PCH
Symptom_DevicesInUse:
 4164 4164 ryan F.... pulseaudio
 /dev/snd/pcmC0D0p: ryan F...m pulseaudio
Symptom_Jack: Speaker, Internal
Symptom_Type: No sound at all
Title: [700Z3A/700Z4A/700Z5A/700Z5B, Realtek ALC269VC, Speaker, Internal] No sound at all
UpgradeStatus: Upgraded to precise on 2012-06-09 (23 days ago)
dmi.bios.date: 03/20/2012
dmi.bios.vendor: Phoenix Technologies Ltd.
dmi.bios.version: 12FD
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: 700Z3A/700Z4A/700Z5A/700Z5B
dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.board.version: FAB1
dmi.chassis.asset.tag: Asset Tag
dmi.chassis.type: 9
dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.chassis.version: 0.1
dmi.modalias: dmi:bvnPhoenixTechnologiesLtd.:bvr12FD:bd03/20/2012:svnSAMSUNGELECTRONICSCO.,LTD.:pn700Z3A/700Z4A/700Z5A/700Z5B:pvr0.1:rvnSAMSUNGELECTRONICSCO.,LTD.:rn700Z3A/700Z4A/700Z5A/700Z5B:rvrFAB1:cvnSAMSUNGELECTRONICSCO.,LTD.:ct9:cvr0.1:
dmi.product.name: 700Z3A/700Z4A/700Z5A/700Z5B
dmi.product.version: 0.1
dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.