Kernel cannot detect HDMI connection

[Guillaume VILLALONGA]

Hie,

I have the same problem than
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1994144
with my computer HP 17-cn2119 under Kubuntu 22.04. I tried also Kubuntu 23.04 and 23.10, xorg and wayland, same problem. I also tested openSuse 15.5 and there was the same issue.

Screen and HDMI cable worked with the previous computer HP 17-p128nf, and work actually on Windows 11 (dualboot).
Seems to be a Linux problem.

Thank you for your help

ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: linux-image-6.2.0-37-generic 6.2.0-37.38~22.04.1
ProcVersionSignature: Ubuntu 6.2.0-37.38~22.04.1-generic 6.2.16
Uname: Linux 6.2.0-37-generic x86_64
ApportVersion: 2.20.11-0ubuntu82.5
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: KDE
Date: Sun Dec 3 15:09:53 2023
InstallationDate: Installed on 2023-12-03 (0 days ago)
InstallationMedia: Kubuntu 22.04.3 LTS "Jammy Jellyfish" - Release amd64 (20230807.1)
SourcePackage: linux-signed-hwe-6.2
UpgradeStatus: No upgrade log present (probably fresh install)

[Ángel (angel-1)]

I have been helping troubleshoot the same issue where HDMI stopped working on a Ubuntu 22.04 that had just been upgraded (also HP hardware). You beat me to reporting it.
The issue was finally determined to be caused by a kernel version upgrade. Booting from the previous kernel (as selected on GRUB) the problem is gone.

guillaume2a, try installing linux-image-6.2.0-36-generic and *booting* that kernel version (it will probably not be chosen as default). I expect your HDMI screen will work with that one.

TL;DR: linux-image-6.2.0-36-generic works, linux-image-6.2.0-37-generic fails

[Launchpad Janitor (janitor)]

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

[Guillaume VILLALONGA (guillaume2a)]

Thanks a lot Ángel

How can I install linux-image-6.2.0-36-generic ? I downloaded it with synaptic but nothing happened.

Thanks for your help

[Ángel (angel-1)]

If the new linux image got properly installed, it should have added a new entry in GRUB to boot that kernel (it will probably be placed inside an "Advanced options" submenu)

I expect it will at least work before starting wayland, and it will detect and list the monitor. Depending on the drivers used, you might face an API mismatch later requiring further fixing.

[Ángel (angel-1)]

Note: we also needed to remove nvidia-firmware-535-535-146.0.2, staying on nvidia-firmware-535-535-129.0.3

If using nvidia-firmware-535-535-146.0.2 *or* running linux-image-6.2.0-37, it didn't work.

[Guillaume VILLALONGA (guillaume2a)]

There are two options :
- Ubuntu, with Linux 6.5.0-14-generic
- Ubuntu, with Linux 6.2.0-39-generic
And no HDMI with both

[Guillaume VILLALONGA (guillaume2a)]

I tested also kubuntu-20.04.6 on a USB key and always no HDMI