Public bug reported:

I have configured my PC to lock the screen automatically after a period
of inactivity. Often when I come back to my PC I'm unable to login due
to gnome shell running at 100% CPU (according to htop).

The only way I can log in is to SSH to the machine from another PC and
kill the gnome shell task running at 100%

Other than noting this only happens when I try and unlock the screen I
haven't been able to find any pattern which can explain this behaviour.
I've never had problems with gnome shell while using the PC.

Some info about the machine Ubuntu 20.04, Nvidia drivers, 4k monitors

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: gnome-shell 3.36.4-1ubuntu1~20.04.2
ProcVersionSignature: Ubuntu 5.4.0-45.49-generic 5.4.55
Uname: Linux 5.4.0-45-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu27.8
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Mon Sep  7 22:01:37 2020
DisplayManager: gdm3
InstallationDate: Installed on 2020-09-05 (2 days ago)
InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
ProcEnviron:
 LANGUAGE=en_AU:en
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_AU.UTF-8
 SHELL=/bin/bash
RelatedPackageVersions: mutter-common 3.36.4-0ubuntu0.20.04.2
SourcePackage: gnome-shell
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: gnome-shell (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug focal

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https://bugs.launchpad.net/bugs/1894666

Title:
  Gnome high CPU preventing login after screen lock

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