PCI/internal sound card not detected

[Pradeep Khileri]

The speaker used to work fine but the internal microphone was not showing in Settings -> Sound -> Input.
I tried to purge alsa.

$ sudo apt-get remove --purge alsa-base pulseaudio

and then reinstall it
$ sudo apt-get install ubuntu-desktop alsa-base pulseaudio

After that even output sound is not working.it is showing "Dummy Output" in Settings -> Sound -> Output.
After that i run this command
$ cat /proc/asound/cards
it is showing "--- no soundcards ---"

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: alsa-base 1.0.25+dfsg-0ubuntu5
ProcVersionSignature: Ubuntu 5.4.0-48.52~18.04.1-generic 5.4.60
Uname: Linux 5.4.0-48-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.18
Architecture: amd64
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
CurrentDesktop: ubuntu:GNOME
Date: Tue Oct 13 14:01:16 2020
InstallationDate: Installed on 2020-10-08 (5 days ago)
InstallationMedia: Ubuntu 18.04.4 LTS "Bionic Beaver" - Release amd64 (20200203.1)
PackageArchitecture: all
SourcePackage: alsa-driver
Symptom: audio
Title: PCI/internal sound card not detected
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/26/2020
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.4.1
dmi.board.name: 02VYDM
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 10
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvr1.4.1:bd08/26/2020:svnDellInc.:pnLatitude3410:pvr:rvnDellInc.:rn02VYDM:rvrA00:cvnDellInc.:ct10:cvr:
dmi.product.family: Latitude
dmi.product.name: Latitude 3410
dmi.product.sku: 09EC
dmi.sys.vendor: Dell Inc.