[ASRock B450 Pro4, Realtek ALC892, Green Headphone Out, Front] No sound at all by default

[Aleksandar]

The problem happens on a freshly installed Ubuntu 18.04.

On first boot after reinstall, the state of pavucontrol and Ubuntu's sound settings is as shown in the attachment 1.png

When I change HDA-Audio Generic to Analog Stereo Duplex in pavucontrol, the state is as shown in the attachment 2.png and I still don't have sound on Front

One workaround about this is to use pavucontrol to change the port to Headpones in Output Devices tab, as shown in attachment 3.png, and the Front will output sound.

The problem is I have to change to Headphones in Output Devices every time I boot the system.

The specs of my machine are:

CPU: Ryzen 6 3600
Motherboard: AsRock b450 PRO 4 with BIOS version 3.60

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: alsa-base 1.0.25+dfsg-0ubuntu5
ProcVersionSignature: Ubuntu 5.0.0-31.33~18.04.1-generic 5.0.21
Uname: Linux 5.0.0-31-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.7
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: mate 1324 F.... pulseaudio
 /dev/snd/controlC1: mate 1324 F.... pulseaudio
 /dev/snd/pcmC1D0p: mate 1324 F...m pulseaudio
 /dev/snd/timer: mate 1324 f.... pulseaudio
CurrentDesktop: ubuntu:GNOME
Date: Mon Oct 21 11:07:55 2019
InstallationDate: Installed on 2019-10-21 (0 days ago)
InstallationMedia: Ubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805)
PackageArchitecture: all
SourcePackage: alsa-driver
Symptom: audio
Symptom_AlsaPlaybackTest: ALSA playback test through plughw:Generic failed
Symptom_Card: HD-Audio Generic - HD-Audio Generic
Symptom_DevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: mate 1324 F.... pulseaudio
 /dev/snd/controlC1: mate 1324 F.... pulseaudio
 /dev/snd/pcmC1D0p: mate 1324 F...m pulseaudio
 /dev/snd/timer: mate 1324 f.... pulseaudio
Symptom_Jack: Green Headphone Out, Front
Symptom_Type: No sound at all
Title: [To Be Filled By O.E.M., Realtek ALC892, Green Headphone Out, Front] No sound at all
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/31/2019
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: P3.60
dmi.board.name: B450 Pro4
dmi.board.vendor: ASRock
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrP3.60:bd07/31/2019:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnB450Pro4:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.family: To Be Filled By O.E.M.
dmi.product.name: To Be Filled By O.E.M.
dmi.product.sku: To Be Filled By O.E.M.
dmi.product.version: To Be Filled By O.E.M.
dmi.sys.vendor: To Be Filled By O.E.M.