PCI/internal sound card not detected

[Nirav]

i have asus P5KC motherboard with nvidia 210 graphics card
my computer doesn't detect sound card
it detects only graphics card's HDMI audio

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: alsa-base 1.0.25+dfsg-0ubuntu5
ProcVersionSignature: Ubuntu 4.4.0-38.57-generic 4.4.19
Uname: Linux 4.4.0-38-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: nirav 2000 F.... pulseaudio
CurrentDesktop: Unity
Date: Thu Oct 6 11:36:14 2016
InstallationDate: Installed on 2016-09-26 (9 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=en_IN:en
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_IN
 SHELL=/bin/bash
SourcePackage: alsa-driver
Symptom: audio
Title: PCI/internal sound card not detected
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 06/25/2008
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 1203
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: P5KC
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: Rev 1.xx
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1203:bd06/25/2008:svnSystemmanufacturer:pnP5KC:pvrSystemVersion:rvnASUSTeKComputerINC.:rnP5KC:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: P5KC
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer