[Satellite C665, Conexant CX20585, Speaker, Internal] fails after a while

I Upgrade the OS from 12.04 to 14.04 and getting issue with sound as sometime it works and after a while sound is not coming to speaker as it is working fine with headphone.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: alsa-base 1.0.25+dfsg-0ubuntu4
ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
Uname: Linux 3.13.0-24-generic i686
ApportVersion: 2.14.1-0ubuntu3
Architecture: i386
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: ritesh 1762 F.... pulseaudio
                      ritesh 6359 F.... pulseaudio
CurrentDesktop: Unity
Date: Sat Apr 19 14:52:53 2014
InstallationDate: Installed on 2014-04-18 (0 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release i386 (20140417)
PackageArchitecture: all
SourcePackage: alsa-driver
Symptom: audio
Symptom_Card: Built-in Audio - HDA Intel MID
Symptom_Jack: Speaker, Internal
Symptom_Type: Sound works for a while, then breaks
Title: [Satellite C665, Conexant CX20585, Speaker, Internal] fails after a while
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 11/09/2011
dmi.bios.vendor: INSYDE
dmi.bios.version: 2.10
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: Portable PC
dmi.board.vendor: TOSHIBA
dmi.board.version: Base Board Version
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: Chassis Manufacturer
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnINSYDE:bvr2.10:bd11/09/2011:svnTOSHIBA:pnSatelliteC665:pvrPSC14G-01900V:rvnTOSHIBA:rnPortablePC:rvrBaseBoardVersion:cvnChassisManufacturer:ct10:cvrChassisVersion:
dmi.product.name: Satellite C665
dmi.product.version: PSC14G-01900V
dmi.sys.vendor: TOSHIBA