[iMac15,1, Cirrus Logic CS4206, Speaker, Internal] No sound at all

[Mustafa Said Uçar]

I have iMac 15.1 2014. Sometimes my internal speaker works, sometimes doesn't. When I ran the ubuntu-bug tool, internal speakers worked, however when I use spotify or youtube from different browsers, there are no sound at all. I did remove&install alsa-lib again and again but no luck.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: alsa-base 1.0.25+dfsg-0ubuntu5
ProcVersionSignature: Ubuntu 4.10.0-42.46~16.04.1-generic 4.10.17
Uname: Linux 4.10.0-42-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.20.1-0ubuntu2.14
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: said 2018 F.... pulseaudio
 /dev/snd/pcmC0D0p: said 2018 F...m pulseaudio
 /dev/snd/controlC0: said 2018 F.... pulseaudio
CurrentDesktop: GNOME
Date: Mon Dec 18 09:42:42 2017
InstallationDate: Installed on 2017-08-01 (138 days ago)
InstallationMedia: Ubuntu-GNOME 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215)
PackageArchitecture: all
SourcePackage: alsa-driver
Symptom: audio
Symptom_AlsaPlaybackTest: ALSA playback test through plughw:PCH failed
Symptom_Card: Built-in Audio - HDA Intel PCH
Symptom_Jack: Speaker, Internal
Symptom_Type: No sound at all
Title: [iMac15,1, Cirrus Logic CS4206, Speaker, Internal] No sound at all
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 02/22/2016
dmi.bios.vendor: Apple Inc.
dmi.bios.version: IM151.88Z.0207.B06.1602221600
dmi.board.asset.tag: Base Board Asset Tag#
dmi.board.name: Mac-FA842E06C61E91C5
dmi.board.vendor: Apple Inc.
dmi.board.version: iMac15,1
dmi.chassis.type: 13
dmi.chassis.vendor: Apple Inc.
dmi.chassis.version: Mac-FA842E06C61E91C5
dmi.modalias: dmi:bvnAppleInc.:bvrIM151.88Z.0207.B06.1602221600:bd02/22/2016:svnAppleInc.:pniMac15,1:pvr1.0:rvnAppleInc.:rnMac-FA842E06C61E91C5:rvriMac15,1:cvnAppleInc.:ct13:cvrMac-FA842E06C61E91C5:
dmi.product.name: iMac15,1
dmi.product.version: 1.0
dmi.sys.vendor: Apple Inc.
mtime.conffile..etc.modprobe.d.alsa-base.conf: 2017-10-24T17:32:41.504894