[UX390UAK, Realtek ALC295, Speaker, Internal] very loud and crackling sound no matter what sound I play

I just installed ubuntu, and immediately had problems of very loud and crackling sound no matter what sound I played.
I tried the three solutions listed here https://wiki.ubuntu.com/Audio/PositionReporting, the three of them resulted in no sound at all, and now even if I revert back everything, I can't get any sound out from the speakers.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: alsa-base 1.0.25+dfsg-0ubuntu5
ProcVersionSignature: Ubuntu 4.15.0-22.24-generic 4.15.17
Uname: Linux 4.15.0-22-generic x86_64
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/pcmC0D0p: remuth 1038 F...m pulseaudio
 /dev/snd/controlC0: remuth 1038 F.... pulseaudio
CurrentDesktop: ubuntu:GNOME
Date: Sun May 27 22:37:20 2018
InstallationDate: Installed on 2018-05-27 (0 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
PackageArchitecture: all
SourcePackage: alsa-driver
Symptom: audio
Symptom_AlsaPlaybackTest: ALSA playback test through plughw:PCH failed
Symptom_Card: Built-in Audio - HDA Intel PCH
Symptom_DevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/pcmC0D0p: remuth 1038 F...m pulseaudio
 /dev/snd/controlC0: remuth 1038 F.... pulseaudio
Symptom_Jack: Speaker, Internal
Symptom_Type: No sound at all
Title: [UX390UAK, Realtek ALC295, Speaker, Internal] No sound at all
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/25/2017
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: UX390UAK.312
dmi.board.asset.tag: ATN12345678901234567
dmi.board.name: UX390UAK
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.:bvrUX390UAK.312:bd04/25/2017:svnASUSTeKCOMPUTERINC.:pnUX390UAK:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnUX390UAK:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
dmi.product.family: UX
dmi.product.name: UX390UAK
dmi.product.version: 1.0
dmi.sys.vendor: ASUSTeK COMPUTER INC.