Public bug reported:

Found a bug and a solution. Using two screens, a laptopt with a built in
display and a secondary display. If the Dock is set to "Show on" extenal
display X.org usually crashes to login screen (all gui applications
gone) when external display is disconnected or laptop goes to sleep and
connected to a new display.

The sollution that worked for me is to reset the dock placement back to
Built-in display. "Seetings -> Ubuntu Desktop -> Dock -> Show on" and
then choose "1. Built-in display". Other options seems to crash window
manager.

ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: xorg 1:7.7+23ubuntu3
ProcVersionSignature: Ubuntu 6.8.0-56.58-generic 6.8.12
Uname: Linux 6.8.0-56-generic x86_64
ApportVersion: 2.28.1-0ubuntu3.5
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CasperMD5CheckResult: pass
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Wed Apr  2 09:45:05 2025
DistUpgraded: 2024-05-27 12:17:17,573 DEBUG migrateToDeb822Sources()
DistroCodename: noble
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes
GraphicsCard:
 Intel Corporation Raptor Lake-P [Iris Xe Graphics] [8086:a7a0] (rev 04) 
(prog-if 00 [VGA controller])
   Subsystem: Lenovo Raptor Lake-P [Iris Xe Graphics] [17aa:230e]
InstallationDate: Installed on 2023-12-07 (482 days ago)
InstallationMedia: Ubuntu 23.10.1 "Mantic Minotaur" - Release amd64 (20231016.1)
MachineType: LENOVO 21HGS3VX00
ProcEnviron:
 LANG=en_US.UTF-8
 PATH=(custom, no user)
 SHELL=/bin/bash
 TERM=xterm-256color
 XDG_RUNTIME_DIR=<set>
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-6.8.0-56-generic 
root=/dev/mapper/ubuntu--vg-ubuntu--lv ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
Title: Xorg crash
UpgradeStatus: Upgraded to noble on 2024-05-27 (310 days ago)
dmi.bios.date: 10/22/2024
dmi.bios.release: 1.48
dmi.bios.vendor: LENOVO
dmi.bios.version: N3QET48W (1.48 )
dmi.board.asset.tag: Not Available
dmi.board.name: 21HGS3VX00
dmi.board.vendor: LENOVO
dmi.board.version: Not Defined
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.ec.firmware.release: 1.12
dmi.modalias: 
dmi:bvnLENOVO:bvrN3QET48W(1.48):bd10/22/2024:br1.48:efr1.12:svnLENOVO:pn21HGS3VX00:pvrThinkPadP14sGen4:rvnLENOVO:rn21HGS3VX00:rvrNotDefined:cvnLENOVO:ct10:cvrNone:skuLENOVO_MT_21HG_BU_Think_FM_ThinkPadP14sGen4:
dmi.product.family: ThinkPad P14s Gen 4
dmi.product.name: 21HGS3VX00
dmi.product.sku: LENOVO_MT_21HG_BU_Think_FM_ThinkPad P14s Gen 4
dmi.product.version: ThinkPad P14s Gen 4
dmi.sys.vendor: LENOVO
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.122-1~ubuntu0.24.04.1
version.libgl1-mesa-dri: libgl1-mesa-dri 24.2.8-1ubuntu1~24.04.1
version.libgl1-mesa-glx: libgl1-mesa-glx N/A
version.xserver-xorg-core: xserver-xorg-core 2:21.1.12-1ubuntu1.2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:22.0.0-1build1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20210115-1build1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.17-2build1

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug crash noble ubuntu wayland-session

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You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/2105979

Title:
  Xorg crash

Status in xorg package in Ubuntu:
  New

Bug description:
  Found a bug and a solution. Using two screens, a laptopt with a built
  in display and a secondary display. If the Dock is set to "Show on"
  extenal display X.org usually crashes to login screen (all gui
  applications gone) when external display is disconnected or laptop
  goes to sleep and connected to a new display.

  The sollution that worked for me is to reset the dock placement back
  to Built-in display. "Seetings -> Ubuntu Desktop -> Dock -> Show on"
  and then choose "1. Built-in display". Other options seems to crash
  window manager.

  ProblemType: Bug
  DistroRelease: Ubuntu 24.04
  Package: xorg 1:7.7+23ubuntu3
  ProcVersionSignature: Ubuntu 6.8.0-56.58-generic 6.8.12
  Uname: Linux 6.8.0-56-generic x86_64
  ApportVersion: 2.28.1-0ubuntu3.5
  Architecture: amd64
  BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
  CasperMD5CheckResult: pass
  CompositorRunning: None
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Apr  2 09:45:05 2025
  DistUpgraded: 2024-05-27 12:17:17,573 DEBUG migrateToDeb822Sources()
  DistroCodename: noble
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Intel Corporation Raptor Lake-P [Iris Xe Graphics] [8086:a7a0] (rev 04) 
(prog-if 00 [VGA controller])
     Subsystem: Lenovo Raptor Lake-P [Iris Xe Graphics] [17aa:230e]
  InstallationDate: Installed on 2023-12-07 (482 days ago)
  InstallationMedia: Ubuntu 23.10.1 "Mantic Minotaur" - Release amd64 
(20231016.1)
  MachineType: LENOVO 21HGS3VX00
  ProcEnviron:
   LANG=en_US.UTF-8
   PATH=(custom, no user)
   SHELL=/bin/bash
   TERM=xterm-256color
   XDG_RUNTIME_DIR=<set>
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-6.8.0-56-generic 
root=/dev/mapper/ubuntu--vg-ubuntu--lv ro quiet splash vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  Title: Xorg crash
  UpgradeStatus: Upgraded to noble on 2024-05-27 (310 days ago)
  dmi.bios.date: 10/22/2024
  dmi.bios.release: 1.48
  dmi.bios.vendor: LENOVO
  dmi.bios.version: N3QET48W (1.48 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 21HGS3VX00
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Defined
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.ec.firmware.release: 1.12
  dmi.modalias: 
dmi:bvnLENOVO:bvrN3QET48W(1.48):bd10/22/2024:br1.48:efr1.12:svnLENOVO:pn21HGS3VX00:pvrThinkPadP14sGen4:rvnLENOVO:rn21HGS3VX00:rvrNotDefined:cvnLENOVO:ct10:cvrNone:skuLENOVO_MT_21HG_BU_Think_FM_ThinkPadP14sGen4:
  dmi.product.family: ThinkPad P14s Gen 4
  dmi.product.name: 21HGS3VX00
  dmi.product.sku: LENOVO_MT_21HG_BU_Think_FM_ThinkPad P14s Gen 4
  dmi.product.version: ThinkPad P14s Gen 4
  dmi.sys.vendor: LENOVO
  version.compiz: compiz N/A
  version.libdrm2: libdrm2 2.4.122-1~ubuntu0.24.04.1
  version.libgl1-mesa-dri: libgl1-mesa-dri 24.2.8-1ubuntu1~24.04.1
  version.libgl1-mesa-glx: libgl1-mesa-glx N/A
  version.xserver-xorg-core: xserver-xorg-core 2:21.1.12-1ubuntu1.2
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:22.0.0-1build1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20210115-1build1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:1.0.17-2build1

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