Thanks for the bug report.

There doesn't seem to be anything freeze-related being written to the
log so there are a few possibilities:

* The kernel froze (most likely in nvidia)
* gnome-shell or Xorg froze without crashing
* gnome-shell or Xorg did crash and there might be evidence in /var/crash

If you find no evidence in /var/crash then I would try either
uninstalling the Nvidia driver or the card itself, or disabling the card
in the BIOS. Just to see what it takes to avoid the freeze. Because I'm
guessing if you boot with purely Intel graphics then the bug will stop
happening (and not just because that will default to Wayland instead of
Xorg).

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to gnome-shell in Ubuntu.
https://bugs.launchpad.net/bugs/2003844

Title:
  Screensharing from my browser (Firefox snap) freezes the display
  requiring a hard reboot

Status in gnome-shell package in Ubuntu:
  New

Bug description:
  In the firefox snap (although I'm not convinced it is specific to the
  firefox snap) when in a google meets session, I choose to share either
  my screen or a specific browser tab.

  In ~40% of instances this results in a complete visual freeze of my
  system with no interactivity.

  Audio / Microphone / Webcam /keyboard are still functional during this
  time. But I need to hard restart to be able to interact with my system
  again.

  This happens more often the longer my system has been running and is
  pretty much guaranteed to happen once a day if I am presenting
  multiple times.

  For reference I have two monitors: A UHD Monitor 1440p (60HZ) and a
  high refresh (144HZ) 1080p Monitor, both have scaling set to 100%. It
  does not seem to matter which screen I'm presenting to the other.

  I have attached the journalctl of my previous boot.

  ProblemType: Bug
  DistroRelease: Ubuntu 22.04
  Package: gnome-shell 42.5-0ubuntu1
  ProcVersionSignature: Ubuntu 5.15.0-58.64-generic 5.15.74
  Uname: Linux 5.15.0-58-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair nvidia_modeset 
nvidia
  ApportVersion: 2.20.11-0ubuntu82.3
  Architecture: amd64
  CasperMD5CheckResult: pass
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Jan 25 08:51:10 2023
  DisplayManager: gdm3
  InstallationDate: Installed on 2022-07-31 (177 days ago)
  InstallationMedia: Ubuntu 22.04 LTS "Jammy Jellyfish" - Release amd64 
(20220419)
  RelatedPackageVersions: mutter-common 42.5-0ubuntu1
  SourcePackage: gnome-shell
  UpgradeStatus: No upgrade log present (probably fresh install)

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