After reboot/power up, even if headphones are connected, the selected output are the speakers

[Luca De Cave]

The bug is little: after power up/reboot the selected output for audio are always the speakers, even if the headphones are connected.
Audio works as supposed, I have just to switch from speakers to headphones in the audio panel inside the settings page if I have headphones plugged in.

My system is an upgrade from Ubuntu 16.04 LTS (now 18.04 LTS)

uname -a output
Linux muletto 5.4.0-45-generic #49~18.04.2-Ubuntu SMP Wed Aug 26 16:29:02 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

lsb_release -rd output
Description: Ubuntu 18.04.5 LTS
Release: 18.04

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: alsa-base 1.0.25+dfsg-0ubuntu5
ProcVersionSignature: Ubuntu 5.4.0-45.49~18.04.2-generic 5.4.55
Uname: Linux 5.4.0-45-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.17
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: muletto 5653 F.... pulseaudio
CurrentDesktop: ubuntu-communitheme:ubuntu:GNOME
Date: Wed Sep 2 17:37:39 2020
InstallationDate: Installed on 2016-09-04 (1459 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
PackageArchitecture: all
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=it_IT.UTF-8
 SHELL=/bin/bash
SourcePackage: alsa-driver
Symptom: audio
Symptom_AlsaPlaybackTest: ALSA playback test through plughw:PCH successful
Symptom_Card: Audio interno - HDA Intel PCH
Symptom_Jack: Black Headphone Out, Front
Symptom_PulsePlaybackTest: PulseAudio playback test successful
Symptom_Type: None of the above
Title: [Inspiron 5570, Realtek ALC3246, Black Headphone Out, Front] Playback problem
UpgradeStatus: Upgraded to bionic on 2018-08-21 (742 days ago)
dmi.bios.date: 08/15/2018
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.1.8
dmi.board.name: 09YTN7
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 10
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvr1.1.8:bd08/15/2018:svnDellInc.:pnInspiron5570:pvr:rvnDellInc.:rn09YTN7:rvrA00:cvnDellInc.:ct10:cvr:
dmi.product.family: Inspiron
dmi.product.name: Inspiron 5570
dmi.product.sku: 0810
dmi.sys.vendor: Dell Inc.