The bug was not gone when using kernel 4.4

there was also an additional kernel between 4.4 and 4.15 that was
available. I tried that as well. same result.no fix.

Since then I backed up my system and did a completely fresh install of
18.04LTS and the issue is still not fixed.

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https://bugs.launchpad.net/bugs/1786195

Title:
  broken audio/muffled, no system audio

Status in linux package in Ubuntu:
  Incomplete
Status in pulseaudio package in Ubuntu:
  Incomplete

Bug description:
  Ubuntu 18.04.1 LTS
  pulseaudio:
    Installed: 1:11.1-1ubuntu7.1
    Candidate: 1:11.1-1ubuntu7.1
    Version table:
   *** 1:11.1-1ubuntu7.1 500
          500 http://us.archive.ubuntu.com/ubuntu bionic-updates/main amd64 
Packages
          100 /var/lib/dpkg/status
       1:11.1-1ubuntu7 500
          500 http://us.archive.ubuntu.com/ubuntu bionic/main amd64 Packages

  
  expected sound to return to normal/crisp throughout system and media 
applications.

  sound became muffled/distorted throughout all media applications,
  while other system sounds failed altogether. volume up/down failed.
  Chime on reboot also distorted. system and application sounds appear
  normal when used via bluetooth.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: pulseaudio 1:11.1-1ubuntu7.1
  ProcVersionSignature: Ubuntu 4.15.0-30.32-generic 4.15.18
  Uname: Linux 4.15.0-30-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.20.9-0ubuntu7.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  novgorod   1787 F.... pulseaudio
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Aug  9 01:40:50 2018
  InstallationDate: Installed on 2018-08-01 (7 days ago)
  InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 
(20180725)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: pulseaudio
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 02/02/18
  dmi.bios.vendor: Apple Inc.
  dmi.bios.version: MB61.88Z.00CC.B00.1802021826
  dmi.board.asset.tag: Base Board Asset Tag#
  dmi.board.name: Mac-F22C8AC8
  dmi.board.vendor: Apple Inc.
  dmi.chassis.asset.tag: Asset Tag#
  dmi.chassis.type: 10
  dmi.chassis.vendor: Apple Inc.
  dmi.chassis.version: Mac-F22C8AC8
  dmi.modalias: 
dmi:bvnAppleInc.:bvrMB61.88Z.00CC.B00.1802021826:bd02/02/18:svnAppleInc.:pnMacBook6,1:pvr1.0:rvnAppleInc.:rnMac-F22C8AC8:rvr:cvnAppleInc.:ct10:cvrMac-F22C8AC8:
  dmi.product.family: MacBook
  dmi.product.name: MacBook6,1
  dmi.product.version: 1.0
  dmi.sys.vendor: Apple Inc.

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