Same issue here, only reboot seems to solve the problem.
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https://bugs.launchpad.net/bugs/1018789
Title:
Sound through headphones randomly stops working
Status in “pulseaudio” package in Ubuntu:
Confirmed
Bug description:
Sometimes, apparently randomly, sound stops working through the
headphones. Sound still works normally through speakers but not
through headphones. Pulseaudio correctly senses the headphone
plug/unplug and the device appears in the output devices list but no
sound is heard.
I've tried killing pulsaudio and restarting the session but only a
reboot solves the problem.
ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: pulseaudio 1:1.1-0ubuntu15.1
ProcVersionSignature: Ubuntu 3.2.0-26.41-generic-pae 3.2.19
Uname: Linux 3.2.0-26-generic-pae i686
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
AplayDevices:
**** List of PLAYBACK Hardware Devices ****
card 0: Intel [HDA Intel], device 0: STAC92xx Analog [STAC92xx Analog]
Subdevices: 0/1
Subdevice #0: subdevice #0
ApportVersion: 2.0.1-0ubuntu10
Architecture: i386
ArecordDevices:
**** List of CAPTURE Hardware Devices ****
card 0: Intel [HDA Intel], device 0: STAC92xx Analog [STAC92xx Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: gjm 2234 F.... pulseaudio
/dev/snd/pcmC0D0p: gjm 2234 F...m pulseaudio
Card0.Amixer.info:
Card hw:0 'Intel'/'HDA Intel at 0xf6fdc000 irq 49'
Mixer name : 'IDT 92HD71B7X'
Components : 'HDA:111d76b2,1028024f,00100302'
Controls : 20
Simple ctrls : 11
Date: Thu Jun 28 11:20:57 2012
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007)
SourcePackage: pulseaudio
UpgradeStatus: Upgraded to precise on 2012-04-27 (61 days ago)
dmi.bios.date: 10/30/2009
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A18
dmi.board.name: 0X564R
dmi.board.vendor: Dell Inc.
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.modalias:
dmi:bvnDellInc.:bvrA18:bd10/30/2009:svnDellInc.:pnLatitudeE6500:pvr:rvnDellInc.:rn0X564R:rvr:cvnDellInc.:ct8:cvr:
dmi.product.name: Latitude E6500
dmi.sys.vendor: Dell Inc.
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