[Latitude 7440, Realtek ALC289, top speakers and headphones play at same time

[GSF1200S]

The laptop has 2 speakers on the bottom and 2 speakers on the top. When plugging headphones into the 3.5mm jack, the bottom speakers are auto-muted as they are supposed to be (confirmed this in alsamixer); the top speakers however continue to output sound- the headphones work fine, but the top speakers play at the same time.

If you go into alsamixer to play with levels, you will note that changing "headphones" volume also changes the volume of the speakers on the top. In fact, even with the headphones unplugged, alsamixer shows a "headphones" section (which will control top speaker volume). The bottom speakers which are muted properly are called "Speakers" in alsamixer. It seems this is a pin issue- it seems that the headphones and the top speakers are linked in some way.

The headphone plug action properly mutes all speakers on Windows 11, so this seems to be a software issue.

In case it helps: I have reproduced this behavior on Ubuntu 23.10's live installer, and also on Fedora 39 Workstation's live installer. My Ubuntu 22.04 install is completely up-to-date.

ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: alsa-base 1.0.25+dfsg-0ubuntu7
ProcVersionSignature: Ubuntu 6.2.0-36.37~22.04.1-generic 6.2.16
Uname: Linux 6.2.0-36-generic x86_64
ApportVersion: 2.20.11-0ubuntu82.5
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: poeticrpm 1781 F.... pulseaudio
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Fri Nov 10 14:17:20 2023
InstallationDate: Installed on 2023-10-06 (35 days ago)
InstallationMedia: Ubuntu 22.04.3 LTS "Jammy Jellyfish" - Release amd64 (20230807.2)
PackageArchitecture: all
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: alsa-driver
Symptom: audio
Symptom_AlsaPlaybackTest: ALSA playback test through plughw:PCH failed
Symptom_Card: Built-in Audio - HDA Intel PCH
Symptom_Jack: Black Headphone Out, Right
Symptom_Type: None of the above
Title: [Latitude 7440, Realtek ALC289, Black Headphone Out, Right] Playback problem
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 09/12/2023
dmi.bios.release: 1.8
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.8.1
dmi.board.name: 0NDV55
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 10
dmi.chassis.vendor: Dell Inc.
dmi.ec.firmware.release: 1.6
dmi.modalias: dmi:bvnDellInc.:bvr1.8.1:bd09/12/2023:br1.8:efr1.6:svnDellInc.:pnLatitude7440:pvr:rvnDellInc.:rn0NDV55:rvrA00:cvnDellInc.:ct10:cvr:sku0C0B:
dmi.product.family: Latitude
dmi.product.name: Latitude 7440
dmi.product.sku: 0C0B
dmi.sys.vendor: Dell Inc.
mtime.conffile..etc.modprobe.d.alsa-base.conf: 2023-11-10T13:48:00.967491

[Launchpad Janitor (janitor)]

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

[Sela Trsel (lsidem)]

This bug has also been reported on Ask Ubuntu (https://askubuntu.com/a/1503441), with one user reporting that downgrading the Dell BIOS firmware resolved the issue.

Additionally, I can confirm that this bug is also present on other distros (e.g., Fedora 39, k6.7.4-200.fc39.x86_64, ) and remains present in the most recent Dell BIOS (v1.11.0).

In case it's helpful for debugging, the sound that plays through the speaker after plugging in the headphones lacks bass response, as if only the high frequencies are being sent through the speakers. The headphones do seem to output the full frequency range.

Incidentally, I'm also experiencing a continuous faint white-noise through the speakers as long as sound is playing (and for a few seconds afterwards, until the snd_hda_intel power save save settings kick in), and this noise is also there when headphones are plugged in (i.e., the speakers play this noise, not the headphones). Similar to the other issue, this one only occurs in my Linux distro and not on Windows. I assume these two problems are unrelated though, and perhaps the latter one is even unique to my machine...?