Comment 0 for bug 1577599

For a better explanation, here is a video I've made. https://youtu.be/8q092XpLT-Y

For further diagnostics, here is a ubuntu forum post I've made. http://ubuntuforums.org/showthread.php?t=2322708

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: alsa-base 1.0.25+dfsg-0ubuntu5
ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
Uname: Linux 4.4.0-21-generic x86_64
ApportVersion: 2.20.1-0ubuntu2
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/pcmC2D0c: deviantxs 1672 F...m pulseaudio
 /dev/snd/controlC2: deviantxs 1672 F.... pulseaudio
 /dev/snd/controlC0: deviantxs 1672 F.... pulseaudio
 /dev/snd/controlC1: deviantxs 1672 F.... pulseaudio
CurrentDesktop: Unity
Date: Mon May 2 16:35:54 2016
InstallationDate: Installed on 2016-04-30 (2 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
PackageArchitecture: all
SourcePackage: alsa-driver
Symptom: audio
Symptom_AlsaPlaybackTest: ALSA playback test through plughw:SB failed
Symptom_Card: Built-in Audio - HDA ATI SB
Symptom_Jack: Green Line Out, Rear
Symptom_Type: Digital clip or distortion, or "overdriven" sound
Title: [CM1855, Realtek ALC892, Green Line Out, Rear] Sound is distorted
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/20/2013
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 1501
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: CM1855
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: Rev 1.xx
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1501:bd08/20/2013:svnASUSTeKCOMPUTERINC.:pnCM1855:pvrTobefilledbyO.E.M.:rvnASUSTeKCOMPUTERINC.:rnCM1855:rvrRev1.xx:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.name: CM1855
dmi.product.version: To be filled by O.E.M.
dmi.sys.vendor: ASUSTeK COMPUTER INC.