[Precision 5530, Realtek ALC3266] No sound after reboot until headphones are unplugged and plugged back in

[SR]

Looks like a frequent problem that hits my system : I have no sound on my headphones after I reboot my laptop until I unplug and plug back in the headphones.
I *may* have sound through the PC speaker. I used to have none, but today sound came out of it. As I have upgraded to 20.04 and have done some modifications in config files some time ago with 19.xx, I'm unsure this is reliable information.
I've tried to apply some solutions found here or there, without success.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: alsa-base 1.0.25+dfsg-0ubuntu5
ProcVersionSignature: Ubuntu 5.4.0-29.33-generic 5.4.30
Uname: Linux 5.4.0-29-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: stan 2001 F.... pulseaudio
 /dev/snd/pcmC0D0p: stan 2001 F...m pulseaudio
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Wed May 20 08:08:37 2020
InstallationDate: Installed on 2019-04-26 (389 days ago)
InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Release amd64 (20190416)
PackageArchitecture: all
SourcePackage: alsa-driver
Symptom: audio
Symptom_AlsaPlaybackTest: ALSA playback test through plughw:PCH successful
Symptom_Card: Built-in Audio - HDA Intel PCH
Symptom_DevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: gdm 1570 F.... pulseaudio
                      stan 2001 F.... pulseaudio
 /dev/snd/pcmC0D0p: stan 2001 F...m pulseaudio
Symptom_Jack: Black Headphone Out, Left
Symptom_PulsePlaybackTest: PulseAudio playback test successful
Symptom_Type: No sound at all
Title: [Precision 5530, Realtek ALC3266, Black Headphone Out, Left] No sound at all
UpgradeStatus: Upgraded to focal on 2020-05-07 (12 days ago)
dmi.bios.date: 12/25/2019
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.15.0
dmi.board.name: 0N0DK2
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 10
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvr1.15.0:bd12/25/2019:svnDellInc.:pnPrecision5530:pvr:rvnDellInc.:rn0N0DK2:rvrA00:cvnDellInc.:ct10:cvr:
dmi.product.family: Precision
dmi.product.name: Precision 5530
dmi.product.sku: 087D
dmi.sys.vendor: Dell Inc.
mtime.conffile..etc.modprobe.d.alsa-base.conf: 2020-04-10T16:49:20.600250

[Hui Wang (hui.wang)]

Please take a look at this bug, maybe your problem is same as this one: https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/1876065

[SR (esserre)]

Hi @hui.wang, thanks for your interest. AFAIU, the bug I report is the opposite of #1876065. In my case, it always works when I plug in the headphones after unplugging them.
The reported bug very looks like https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1442428 which was, I presume, caused by another root cause as it has been fixed.

[SR (esserre)]

@seb128 what info do you need me to add for the report to be complete ?

[SR (esserre)]

Well, I'm confused : how can I make this report useful ? Or is it worthless that I create such reports ?

[Sebastien Bacher (seb128)]

Sorry, I just saw the question from Hui and it seemed to need confirmation if it was the same issue, since it's not I'm setting it back to New