Have been regularly applying Software Updates with varying degrees of
success.

One thing I did see, once, which was interesting. The "Tick Tock" noise
happened at the same time that the volume indicator started changing
"quiet then loud".

Theory - there are two things changing the sound volume - one quiet, one
loud and the ticking noise is happening because of that. So, where does
the sound system do that, then? If that can be found, the bug can be
killed.

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https://bugs.launchpad.net/bugs/1899145

Title:
  Getting a repeating, white-noise like "tik tok" from speakers

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  This bug appears on 20.04 and 20.10

  I believe it is a kernel bug.

  Currently reporting from Ubuntu 20.10 (beta), having updated packages.
  Kernel is x86_64, 5.8.0-21

  It can be mitigated by the echo command,namely:
  echo -e "\a\a\a"

  So I wrote a small shell script to do this:-
  #!/usr/bin/env bash
  while true
  do
      date
      echo -e "\aShh..."
      sleep 5
  done

  ProblemType: Bug
  DistroRelease: Ubuntu 20.10
  Package: linux-image-5.8.0-21-generic 5.8.0-21.22
  ProcVersionSignature: Ubuntu 5.8.0-21.22-generic 5.8.13
  Uname: Linux 5.8.0-21-generic x86_64
  ApportVersion: 2.20.11-0ubuntu49
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  thomas     1239 F.... pulseaudio
  CasperMD5CheckResult: skip
  CurrentDesktop: ubuntu:GNOME
  Date: Fri Oct  9 10:45:13 2020
  InstallationDate: Installed on 2020-10-09 (0 days ago)
  InstallationMedia: Ubuntu 20.10 "Groovy Gorilla" - Beta amd64 (20200930)
  IwConfig:
   lo        no wireless extensions.
   
   enp63s0   no wireless extensions.
  MachineType: Hewlett-Packard HP Compaq dc5700 Microtower
  ProcFB: 0 i915drmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.8.0-21-generic 
root=UUID=9853fe4c-53c3-4680-8919-1e3bd68539d4 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-5.8.0-21-generic N/A
   linux-backports-modules-5.8.0-21-generic  N/A
   linux-firmware                            1.190
  RfKill:
   
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/13/2007
  dmi.bios.release: 2.4
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: 786E2 v02.04
  dmi.board.name: 0A60h
  dmi.board.vendor: Hewlett-Packard
  dmi.chassis.type: 6
  dmi.chassis.vendor: Hewlett-Packard
  dmi.modalias: 
dmi:bvnHewlett-Packard:bvr786E2v02.04:bd04/13/2007:br2.4:svnHewlett-Packard:pnHPCompaqdc5700Microtower:pvr:rvnHewlett-Packard:rn0A60h:rvr:cvnHewlett-Packard:ct6:cvr:
  dmi.product.family: 103C_53307F
  dmi.product.name: HP Compaq dc5700 Microtower
  dmi.product.sku: GE018ET#ABU
  dmi.sys.vendor: Hewlett-Packard

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