PCI/internal sound card not detected

[santosh kumar]

the sound card is not detected. the output option in sound settings is showing dummy output.
i am using ubuntu 14.04 lts
i expected sound while playing a movie but there is no sound.
in the sound settings only the output is displaying only dummy out put.(i connected my inspiron 3250 desktop to tv via hdmi, even when external speakers are connected system is not reading them.)

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: alsa-base 1.0.25+dfsg-0ubuntu4
ProcVersionSignature: Ubuntu 3.19.0-75.83~14.04.1-generic 3.19.8-ckt22
Uname: Linux 3.19.0-75-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.21
Architecture: amd64
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
CurrentDesktop: Unity
Date: Mon Dec 5 18:28:50 2016
DistributionChannelDescriptor:
 # This is a distribution channel descriptor
 # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
 canonical-oem-somerville-trusty-amd64-osp1-20150720-0
InstallationDate: Installed on 2016-10-18 (48 days ago)
InstallationMedia: Ubuntu 14.04 "Trusty" - Build amd64 LIVE Binary 20150720-04:06
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: 06/17/2016
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 3.2.4
dmi.board.name: 0DNMV1
dmi.board.vendor: Dell Inc.
dmi.board.version: A01
dmi.chassis.type: 3
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: Not Specified
dmi.modalias: dmi:bvnDellInc.:bvr3.2.4:bd06/17/2016:svnDellInc.:pnInspiron3250:pvrX00:rvnDellInc.:rn0DNMV1:rvrA01:cvnDellInc.:ct3:cvrNotSpecified:
dmi.product.name: Inspiron 3250
dmi.product.version: X00
dmi.sys.vendor: Dell Inc.