PCI/internal sound card not detected

no sound coming either in speaker nor in headphones

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: alsa-base 1.0.25+dfsg-0ubuntu5
ProcVersionSignature: Ubuntu 4.15.0-33.36-generic 4.15.18
Uname: Linux 4.15.0-33-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.3
Architecture: amd64
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
CurrentDesktop: ubuntu:GNOME
Date: Sun Aug 19 18:30:01 2018
InstallationDate: Installed on 2018-08-04 (15 days ago)
InstallationMedia: Ubuntu 16.04.4 LTS "Xenial Xerus" - Release amd64 (20180228)
PackageArchitecture: all
SourcePackage: alsa-driver
Symptom: audio
Title: PCI/internal sound card not detected
UpgradeStatus: Upgraded to bionic on 2018-08-18 (0 days ago)
dmi.bios.date: 09/19/2017
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: X542UQR.300
dmi.board.asset.tag: ATN12345678901234567
dmi.board.name: X542UQR
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.:bvrX542UQR.300:bd09/19/2017:svnASUSTeKCOMPUTERINC.:pnX542UQR:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnX542UQR:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
dmi.product.family: X
dmi.product.name: X542UQR
dmi.product.version: 1.0
dmi.sys.vendor: ASUSTeK COMPUTER INC.
mtime.conffile..etc.modprobe.d.alsa-base.conf: 2018-08-19T18:10:14.264377