Ubuntu 24.04 no sound

Hi,

I have a new Dell 14 plus DB14250 that I setup as a dual boot WIndows 11/Ubuntu 24.04 system.

Installation worked smoothly except on Ubuntu no audio device was found (except "dummy").  Web advice didn't resolve the issue (for me).

Before fix:

Settings->Sound->Output: dummy

I did a distribution upgrade that fixed the problem.

After fix:

Settings->Sound->Output: Lunar Lake-M HD-Audio Controller.

Maybe this is useful?

Before Upgrade:

uname -a
Linux 6.14.0-36-generic #36~24.04.1-Ubuntu SMP PREEMPT_DYNAMIC Wed Oct 15 15:45:17 UTC 2 x86_64 x86_64 x86_64 GNU/Linux

cat /etc/os-release
PRETTY_NAME="Ubuntu 24.04.3 LTS"
NAME="Ubuntu"
VERSION_ID="24.04"
VERSION="24.04.3 LTS (Noble Numbat)"

----

Dist upgrade
sudo apt-get dist-upgrade
sudo do-release-upgrade -d

-----

After Upgrade:

uname -a

Linux 6.17.0-5-generic #5-Ubuntu SMP PREEMPT_DYNAMIC Mon Sep 22 10:00:33 UTC 2025 x86_64 GNU/Linux
cat /etc/os-release
PRETTY_NAME="Ubuntu Resolute Raccoon (development branch)"
NAME="Ubuntu"
VERSION_ID="26.04"