[Bug 1873384] [NEW] Headphone has no sound out

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Computer:
Dell inspiron 15 5577 Gaming
intel i5 7300HQ version
System:
Kubuntu 20.04
Bug:
Plug-in headphone has no sound out, meanwhile computer's speaker is okay when unplugged the headphone.
Additional information:
Headphone is okay when kubuntu 18.04.3 is installed on the computer.
Alsamixer is checked and headphone are not mute.
Headphone plugin state can be correctly detected, and speaker can automatically mute until headphone unplugged.
External usb soundcard is usable with headphone.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: ubiquity 20.04.12
ProcVersionSignature: Ubuntu 5.4.0-24.28-generic 5.4.30
Uname: Linux 5.4.0-24-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
CasperMD5CheckResult: skip
Date: Fri Apr 17 11:14:43 2020
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/kubuntu.seed maybe-ubiquity quiet splash nomodeset ---
InstallationDate: Installed on 2020-04-16 (0 days ago)
InstallationMedia: Kubuntu 20.04 LTS "Focal Fossa" - Beta amd64 (20200416)
ProcEnviron:
 LANGUAGE=zh_CN:zh
 TERM=xterm-256color
 PATH=(custom, no user)
 LANG=zh_CN.UTF-8
 SHELL=/bin/bash
SourcePackage: ubiquity
Symptom: installer
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: ubiquity (Ubuntu)
     Importance: Undecided
     Assignee: 黄闫 (prayerholmes)
         Status: New


** Tags: amd64 apport-bug focal ubiquity-20.04.11
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Headphone has no sound out
https://bugs.launchpad.net/bugs/1873384
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