Public bug reported:

maybe pulseaudio, maybe alsa, i don't know.

I have a stock kubuntu 21.10 (except for 2 files where i used a "too
old" fix that didn't work)

Any audio going to my Behringer 1202USB mixer has clicks about 2 per second. 
That mixer is crackly on startup and shutdown but is new.
Could be something to do with powersaving?

This is a fresh install of kubuntu on my ibm nuc11i7.
I've tried Fedora kde and no repeated clicking.
Windows doesn't click.
But Fedora kde is junk - can't even connect to github :(

Other devices going thru the mixer don't click.  Just the usb audio.
Other audio devices on kubuntu like hdmi or bluetooth audio work fine.

This is maddening :)  click click click click...

others have the issue too.  See...
https://www.reddit.com/r/linuxaudio/comments/tko0i6/sudden_issue_with_audio_interface_clicking_at/i2ntx7s/?context=3

please help me :)

ProblemType: Bug
DistroRelease: Ubuntu 21.10
Package: alsa-base 1.0.25+dfsg-0ubuntu7
ProcVersionSignature: Ubuntu 5.13.0-39.44-generic 5.13.19
Uname: Linux 5.13.0-39-generic x86_64
ApportVersion: 2.20.11-0ubuntu71
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  sh          988 F.... pulseaudio
 /dev/snd/controlC2:  sh          988 F.... pulseaudio
CasperMD5CheckResult: pass
CurrentDesktop: KDE
Date: Tue Mar 29 18:54:40 2022
InstallationDate: Installed on 2022-03-27 (2 days ago)
InstallationMedia: Kubuntu 21.10 "Impish Indri" - Release amd64 (20211012)
PackageArchitecture: all
SourcePackage: alsa-driver
Symptom: audio
Symptom_Card: Built-in Audio - HDA Intel PCH
Symptom_Jack: Mic, Internal
Symptom_PulseAudioLog:
 
Symptom_Type: Volume slider, or mixer problems
Title: [NUC11PAHi7, Realtek ALC256, Mic, Internal] volume slider problem
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 11/13/2020
dmi.bios.release: 0.35
dmi.bios.vendor: Intel Corp.
dmi.bios.version: PATGL357.0035.2020.1113.1353
dmi.board.name: NUC11PABi7
dmi.board.vendor: Intel Corporation
dmi.board.version: K90104-302
dmi.chassis.type: 35
dmi.chassis.vendor: Intel Corporation
dmi.chassis.version: 2.0
dmi.ec.firmware.release: 3.1
dmi.modalias: 
dmi:bvnIntelCorp.:bvrPATGL357.0035.2020.1113.1353:bd11/13/2020:br0.35:efr3.1:svnIntel(R)ClientSystems:pnNUC11PAHi7:pvrM15513-302:rvnIntelCorporation:rnNUC11PABi7:rvrK90104-302:cvnIntelCorporation:ct35:cvr2.0:skuRNUC11PAHi7000:
dmi.product.family: PA
dmi.product.name: NUC11PAHi7
dmi.product.sku: RNUC11PAHi7000
dmi.product.version: M15513-302
dmi.sys.vendor: Intel(R) Client Systems
modified.conffile..etc.default.apport:
 # set this to 0 to disable apport, or to 1 to enable it
 # you can temporarily override this with
 # sudo service apport start force_start=1
 enabled=0
mtime.conffile..etc.default.apport: 2022-03-27T14:12:12.368562
mtime.conffile..etc.modprobe.d.alsa-base.conf: 2022-03-27T16:41:56.751936

** Affects: ubuntu
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug impish

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https://bugs.launchpad.net/bugs/1967030

Title:
  [NUC11PAHi7, Realtek ALC256, Mic, Internal] Behringer 1202USB mixer's
  default usb audio driver clicks

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