HDA Intel PCH on samsung laptop: Headphones not working, speakers are ok

[Sarto Carneiro]

Speakers in my samsung laptop are ok, but headphones don't work (no sound). Using Ubuntu 18.04 defaults.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: alsa-base 1.0.25+dfsg-0ubuntu5
ProcVersionSignature: Ubuntu 5.3.0-46.38~18.04.1-generic 5.3.18
Uname: Linux 5.3.0-46-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.14
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: sartojr 1936 F.... pulseaudio
 /dev/snd/controlC0: sartojr 1936 F.... pulseaudio
CurrentDesktop: ubuntu:GNOME
Date: Sat Apr 11 16:47:32 2020
InstallationDate: Installed on 2020-01-14 (88 days ago)
InstallationMedia: Ubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=pt_BR:pt:en
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=pt_BR.UTF-8
 SHELL=/bin/bash
SourcePackage: alsa-driver
Symptom: audio
Symptom_AlsaPlaybackTest: ALSA playback test through plughw:PCH failed
Symptom_Card: Áudio interno - HDA Intel PCH
Symptom_DevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: gdm 1377 F.... pulseaudio
                      sartojr 1936 F.... pulseaudio
 /dev/snd/controlC0: gdm 1377 F.... pulseaudio
                      sartojr 1936 F.... pulseaudio
Symptom_Jack: Black Headphone Out, Right
Symptom_Type: No sound at all
Title: [760XBE, Realtek ALC256, Black Headphone Out, Right] No sound at all
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 06/10/2019
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: P02REZ.040.190610.FL
dmi.board.asset.tag: No Asset Tag
dmi.board.name: NP760XBE-XW1BR
dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.board.version: SGL9947A0Y-C01-G003-S0001+10.0.17763
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrP02REZ.040.190610.FL:bd06/10/2019:svnSAMSUNGELECTRONICSCO.,LTD.:pn760XBE:pvrP02REZ:rvnSAMSUNGELECTRONICSCO.,LTD.:rnNP760XBE-XW1BR:rvrSGL9947A0Y-C01-G003-S0001+10.0.17763:cvnSAMSUNGELECTRONICSCO.,LTD.:ct10:cvrN/A:
dmi.product.family: Notebook 7 Series
dmi.product.name: 760XBE
dmi.product.sku: SCAI-A5A5-A5A5-A5A5-PREZ
dmi.product.version: P02REZ
dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.
mtime.conffile..etc.modprobe.d.alsa-base.conf: 2020-04-11T15:48:00.584083

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.