[Bug 2068904] Re: Screen restarts and logs out when disconnecting HDMI cable

[AceLan Kao]

Looks like the X or Wayland crashes when HDMI cable is unplugged.

We may need below logs
1. dmesg with drm.debug=0x1e
2. sudo lspci -vvnn

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https://bugs.launchpad.net/bugs/2068904

Title:
  Screen restarts and logs out when disconnecting HDMI cable

Status in ubuntu-meta package in Ubuntu:
  New

Bug description:
  Replication steps:

  1. Start up Ubuntu desktop as usual with HDMI cable connected to external monitor in extended desktop mode.
  2. Log in to Ubuntu desktop.
  3. Launch a few applications (e.g. browser, terminal, etc).
  4. Disconnect HDMI cable.

  Expected behaviour:

  Desktop session should still be available on laptop screen after
  disconnecting HDMI cable.

  Current behaviour:

  Laptop screen goes black and shows the login screen. Logging in again
  shows a fresh desktop session (no open application windows).

  Other information:

  This is a dual-OS machine, with home directory encryption enabled for Ubuntu.
  Installed from Mantic originally, and upgraded to Noble via command line.

  ProblemType: Bug
  DistroRelease: Ubuntu 24.04
  Package: ubuntu-desktop 1.539
  ProcVersionSignature: Ubuntu 6.5.0-35.35-generic 6.5.13
  Uname: Linux 6.5.0-35-generic x86_64
  ApportVersion: 2.28.1-0ubuntu3
  Architecture: amd64
  CasperMD5CheckResult: pass
  CurrentDesktop: ubuntu:GNOME
  Date: Mon Jun 10 21:51:29 2024
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2024-03-14 (88 days ago)
  InstallationMedia: Ubuntu Legacy 23.10 "Mantic Minotaur" - Release amd64 (20231010)
  SourcePackage: ubuntu-meta
  UpgradeStatus: No upgrade log present (probably fresh install)

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