Public bug reported:

Initially Front audio port was in mute and I installed ALSA Mixer and
Unmuted it. Then I'm able to hear background noise and whatever I speak
in the front mic. But I'm not able to hear any other sound played using
Movie player or Rythmbox.

Then I ran "ubuntu-bug -s audio" application. It tried playing beep tone
two times. First time I could hear it but second time I couldn't.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: alsa-base 1.0.25+dfsg-0ubuntu5
ProcVersionSignature: Ubuntu 4.4.0-116.140-generic 4.4.98
Uname: Linux 4.4.0-116-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
ApportVersion: 2.20.1-0ubuntu2.15
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  selvariyan   1962 F.... pulseaudio
 /dev/snd/controlC1:  selvariyan   1962 F.... pulseaudio
CurrentDesktop: Unity
Date: Sun Mar 25 16:11:05 2018
InstallationDate: Installed on 2016-08-06 (595 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:PCH successful
Symptom_Card: Built-in Audio - HDA Intel PCH
Symptom_Jack: Green Headphone Out, Front
Symptom_PulsePlaybackTest: PulseAudio playback test failed
Symptom_Type: Only some of outputs are working
Title: [System Product Name, Realtek ALC1150, Green Headphone Out, Front] 
Playback problem
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 06/23/2017
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 3501
dmi.board.asset.tag: Default string
dmi.board.name: Z170 PRO GAMING
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: Rev X.0x
dmi.chassis.asset.tag: Default string
dmi.chassis.type: 3
dmi.chassis.vendor: Default string
dmi.chassis.version: Default string
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr3501:bd06/23/2017:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnZ170PROGAMING:rvrRevX.0x:cvnDefaultstring:ct3:cvrDefaultstring:
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer

** Affects: alsa-driver (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug xenial

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https://bugs.launchpad.net/bugs/1758644

Title:
  [System Product Name, Realtek ALC1150, Green Headphone Out, Front]
  Playback problem

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