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

[AceLan Kao]

It's the gnome-shell crashes.

[86941.402557] gnome-shell[77896]: segfault at 140 ip 00007e53082487f6 sp 00007e52b37eafe0 error 4 in libc.so.6[7e5308228000+188000] likely on CPU 4 (core 8, socket 0)
[86941.402574] Code: 84 ed 74 60 e8 2b fd fd ff 49 8b 1c 24 49 89 c7 48 85 db 75 15 eb 36 0f 1f 44 00 00 49 8b 5c 24 08 49 83 c4 08 48 85 db 74 23 <44> 3a 2b 75 ed 4c 89 fa 48 89 de 4c 89 f7 e8 f7 fd fd ff 85 c0 75

Could you add "drm.debug=0x1e" to /etc/default/grub change the below line
   GRUB_CMDLINE_LINUX=""
to
   GRUB_CMDLINE_LINUX="log_buf_len=16M drm.debug=0x1e"
Then run
   sudo update-grub
and reboot to capture the dmesg log again after unplug the HDMI.

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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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