[Bug 2083299] Re: Ubuntu 24.04: Occasionally screen stays black while booting

[Daniel van Vugt]

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.

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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)

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