[iMac7,1, Realtek ALC889A, Speaker, Internal] Sound is distorted

[Eugene Golovin]

Sound quality is poor. Like I am listening to very low bitrate audio. Changing levels in alsa doesnt help. Deaf sound like under water.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: alsa-base 1.0.25+dfsg-0ubuntu5
ProcVersionSignature: Ubuntu 5.13.0-30.33~20.04.1-generic 5.13.19
Uname: Linux 5.13.0-30-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.20.11-0ubuntu27.21
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: beatleman 757 F.... pulseaudio
                      beatleman 7666 F.... qashctl
 /dev/snd/pcmC0D0p: beatleman 757 F...m pulseaudio
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Sat Feb 19 03:36:30 2022
InstallationDate: Installed on 2022-02-18 (0 days ago)
InstallationMedia: Ubuntu 20.04.3 LTS "Focal Fossa" - Release amd64 (20210819)
PackageArchitecture: all
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=ru_RU.UTF-8
 SHELL=/bin/bash
SourcePackage: alsa-driver
Symptom: audio
Symptom_AlsaPlaybackTest: ALSA playback test through plughw:Intel successful
Symptom_Card: Встроенное аудио - HDA Intel
Symptom_Jack: Speaker, Internal
Symptom_PulsePlaybackTest: PulseAudio playback test successful
Symptom_Type: Digital clip or distortion, or "overdriven" sound
Title: [iMac7,1, Realtek ALC889A, Speaker, Internal] Sound is distorted
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 03/05/08
dmi.bios.release: 0.1
dmi.bios.vendor: Apple Inc.
dmi.bios.version: IM71.88Z.007A.B03.0803051705
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: Mac-F42386C8
dmi.board.vendor: Apple Inc.
dmi.board.version: PVT
dmi.chassis.asset.tag: Asset Tag#
dmi.chassis.type: 13
dmi.chassis.vendor: Apple Inc.
dmi.chassis.version: Mac-F42386C8
dmi.modalias: dmi:bvnAppleInc.:bvrIM71.88Z.007A.B03.0803051705:bd03/05/08:br0.1:svnAppleInc.:pniMac7,1:pvr1.0:rvnAppleInc.:rnMac-F42386C8:rvrPVT:cvnAppleInc.:ct13:cvrMac-F42386C8:skuSystemSKU#:
dmi.product.family: Mac
dmi.product.name: iMac7,1
dmi.product.sku: System SKU#
dmi.product.version: 1.0
dmi.sys.vendor: Apple Inc.