No sound on Ubuntu 18.04 regardless of any action

[Boris Godunov]

I've had some trouble with sound recently after an update, it won't turn on. I've tried numerous things: from playing around with alsamixer, pulseaudio, pavucontrol to alsa force-reload and reinstalling alsamixer and pulseaudio. No result. It displays everything correctly and seems to be working, but the sound won't come out. On Windows it works perfectly. It did work well before, it just turned off unexpectedly.

I have a dual boot Ubuntu 18.04 with Windows 10, maybe that causes the bug.
I think so because I've had some trouble with my wi-fi adapter not found, which was caused by Windows fast-boot option enabled.

I've asked questions on askubuntu and linux stackexchange, no one knows. Someone suggested that I need to report a bug, and that's what I'm doing. I'm attaching link to the question, as I posted some information there:

https://unix.stackexchange.com/questions/608305/no-sound-on-ubuntu-18-04-after-a-system-update

I am not sure what I can do now to enable it...
Please help.

$ lsb_release -rd:

Description: Ubuntu 18.04.5 LTS
Release: 18.04

$ cat /proc/asound/version:

Advanced Linux Sound Architecture Driver Version k5.4.0-45-generic.

$ aplay --version:

aplay: version 1.1.3 by Jaroslav Kysela <email address hidden>

I hope that I have given enough info about the bug, however if anything else is required, please feel free to ask me. Thanks!

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: alsa-base 1.0.25+dfsg-0ubuntu5
ProcVersionSignature: Ubuntu 5.4.0-45.49~18.04.2-generic 5.4.55
Uname: Linux 5.4.0-45-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.9-0ubuntu7.17
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC2: fortminor 2055 F.... pulseaudio
 /dev/snd/controlC0: fortminor 2055 F.... pulseaudio
 /dev/snd/controlC1: fortminor 2055 F.... pulseaudio
CurrentDesktop: ubuntu:GNOME
Date: Mon Sep 7 15:23:50 2020
InstallationDate: Installed on 2020-08-27 (10 days ago)
InstallationMedia: Ubuntu 18.04.4 LTS "Bionic Beaver" - Release amd64 (20200203.1)
PackageArchitecture: all
SourcePackage: alsa-driver
Symptom: audio
Symptom_AlsaPlaybackTest: ALSA playback test through plughw:Generic_1 failed
Symptom_Card: HD-Audio Generic - HD-Audio Generic
Symptom_Jack: Speaker, Internal
Symptom_Type: No sound at all
Title: [ROG Zephyrus G15 GA502IV_GA502IV, Realtek ALC294, Speaker, Internal] No sound at all
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/03/2020
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: GA502IV.207
dmi.board.asset.tag: ATN12345678901234567
dmi.board.name: GA502IV
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: 1.0
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: ASUSTeK COMPUTER INC.
dmi.chassis.version: 1.0
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrGA502IV.207:bd08/03/2020:svnASUSTeKCOMPUTERINC.:pnROGZephyrusG15GA502IV_GA502IV:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnGA502IV:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
dmi.product.family: ROG Zephyrus G15
dmi.product.name: ROG Zephyrus G15 GA502IV_GA502IV
dmi.product.version: 1.0
dmi.sys.vendor: ASUSTeK COMPUTER INC.