HP pavilion cw1010nl - audio noise

Hi, i've encountered an audio problem after the installation of KDE Neon in my laptop (HP pavilion cw1010nl). I hear a constant noise that is not showed in pavucontrol and even when all the audio peripherals are disabled. When i use windows 10 this problem does not occur. I cannot say in what package i found the bug but i use alsa and pulseaudio. Guide me if you need other informations for better understanding the problem.

Kernel version: 5.9.8
Audio driver in use: snd_hda_intel
Audio device: Advanced Micro Devices, Inc. [AMD] Family 17h (Models 10h-1fh) HD Audio Controller

$ aplay --list-devices
**** List of PLAYBACK Hardware Devices ****
card 0: Generic [HD-Audio Generic], device 3: HDMI 0 [HDMI 0]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: Generic_1 [HD-Audio Generic], device 0: ALC295 Analog [ALC295 Analog]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

$ lsb_release -rd
Description: KDE neon User Edition 5.20
Release: 20.04

$ apt-cache policy alsa-base
alsa-base:
  Installato: 1.0.25+dfsg-0ubuntu5
  Candidato: 1.0.25+dfsg-0ubuntu5
  Tabella versione:
 *** 1.0.25+dfsg-0ubuntu5 500
        500 http://archive.ubuntu.com/ubuntu focal/main amd64 Packages
        100 /var/lib/dpkg/status
---
ProblemType: Bug
ApportVersion: 2.20.11-0ubuntu27.12
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: niccolo 3779 F.... pulseaudio
 /dev/snd/controlC0: niccolo 3779 F.... pulseaudio
CasperMD5CheckResult: skip
CurrentDesktop: KDE
CurrentDmesg: Error: command ['dmesg'] failed with exit code 1: dmesg: read kernel buffer failed: Operation not permitted
DistroRelease: KDE neon 20.04
InstallationDate: Installed on 2020-11-18 (4 days ago)
InstallationMedia: neon user "Focal" - Build amd64 LIVE Binary 20201112-12:05
Package: alsa-driver (not installed)
Tags: focal
Uname: Linux 5.9.8-050908-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm audio cdrom dip lpadmin plugdev sudo
_MarkForUpload: True
dmi.bios.date: 09/24/2019
dmi.bios.release: 15.35
dmi.bios.vendor: AMI
dmi.bios.version: F.35
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: 8615
dmi.board.vendor: HP
dmi.board.version: 46.23
dmi.chassis.type: 10
dmi.chassis.vendor: HP
dmi.chassis.version: Chassis Version
dmi.ec.firmware.release: 46.23
dmi.modalias: dmi:bvnAMI:bvrF.35:bd09/24/2019:br15.35:efr46.23:svnHP:pnHPPavilionLaptop15-cw1xxx:pvr:rvnHP:rn8615:rvr46.23:cvnHP:ct10:cvrChassisVersion:
dmi.product.family: 103C_5335KV HP Pavilion
dmi.product.name: HP Pavilion Laptop 15-cw1xxx
dmi.product.sku: 6LH22EA#ABZ
dmi.sys.vendor: HP