[945GCT-M2, SigmaTel STAC9221 A2, Green Speaker, Rear] No sound at all

[Steve]

I can't listen to any music or watch videos. everything was fine but when I had installed audio-recorder, sound suddenly stopped working. now even sound indicator disappeared.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: pulseaudio 1:8.0-0ubuntu3
ProcVersionSignature: Ubuntu 4.4.0-34.53-generic 4.4.15
Uname: Linux 4.4.0-34-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: ibrokhim 2852 F.... pulseaudio
CurrentDesktop: Unity
Date: Tue Sep 6 10:57:04 2016
InstallationDate: Installed on 2016-08-19 (17 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
SourcePackage: pulseaudio
Symptom: audio
Symptom_AlsaPlaybackTest: ALSA playback test through plughw:Intel successful
Symptom_Card: Built-in Audio - HDA Intel
Symptom_DevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: ibrokhim 2852 F.... pulseaudio
Symptom_Jack: Green Speaker, Rear
Symptom_PulsePlaybackTest: PulseAudio playback test failed
Symptom_Type: No sound at all
Title: [945GCT-M2, SigmaTel STAC9221 A2, Green Speaker, Rear] No sound at all
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 09/17/2007
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 080012
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: 945GCT-M2
dmi.board.vendor: ECS
dmi.board.version: ECS
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: ECS
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr080012:bd09/17/2007:svnECS:pn945GCT-M2:pvr1.x:rvnECS:rn945GCT-M2:rvrECS:cvnECS:ct3:cvrToBeFilledByO.E.M.:
dmi.product.name: 945GCT-M2
dmi.product.version: 1.x
dmi.sys.vendor: ECS