I wonder if there's a race happening (hence intermittent) and sometimes the disk unlock prompt wants to render before the amdgpu driver is available and before the timeout that would switch it to SimpleDRM automatically. Try adding kernel parameter:
plymouth.use-simpledrm to /etc/default/grub (like GRUB_CMDLINE_LINUX="plymouth.use-simpledrm") and then run: sudo update-grub and reboot. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/2083299 Title: Ubuntu 24.04: Occasionally screen stays black while booting Status in linux package in Ubuntu: Incomplete Status in plymouth package in Ubuntu: Incomplete Bug description: Unfortunately the screen stays black before password prompt shows up. This happens since I've migrated from 22.04 to 24.04. Even a fresh install shows the same symptoms. What helps is to detach the HDMI cable, attach it again and the TV shows the password prompt for luks. I did not try yet the removal of "splash" in the parameters. As this was indicated by others who faced the same issue. ProblemType: Bug DistroRelease: Ubuntu 24.04 Package: gdm3 46.0-2ubuntu1 ProcVersionSignature: Ubuntu 6.8.0-45.45-generic 6.8.12 Uname: Linux 6.8.0-45-generic x86_64 ApportVersion: 2.28.1-0ubuntu3.1 Architecture: amd64 CasperMD5CheckResult: unknown CurrentDesktop: ubuntu:GNOME Date: Tue Oct 1 08:12:07 2024 InstallationDate: Installed on 2024-09-29 (2 days ago) InstallationMedia: Ubuntu 24.04.1 LTS "Noble Numbat" - Release amd64 (20240827.1) ProcEnviron: LANG=de_DE.UTF-8 PATH=(custom, no user) SHELL=/bin/bash TERM=xterm-256color XDG_RUNTIME_DIR=<set> SourcePackage: gdm3 UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2083299/+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
