I have been helping troubleshoot the same issue where HDMI stopped working on a Ubuntu 22.04 that had just been upgraded. 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. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux-signed-hwe-6.2 in Ubuntu. https://bugs.launchpad.net/bugs/2045505 Title: Kernel cannot detect HDMI connection Status in linux-signed-hwe-6.2 package in Ubuntu: New Bug description: 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) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-signed-hwe-6.2/+bug/2045505/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
