Thanks for the bug report. Your system log is certainly full of a lot of messages so it's easy to believe you might have high CPU too. But I can't tell what part of gnome-shell they came from.
Since so many bugs are caused by extensions, and nobody else is reporting this issue, the first thing we need to check is all: '[email protected]', 'dash-to- [email protected]', 'screenshot-window-sizer@gnome-shell- extensions.gcampax.github.com', '[email protected]' Please uninstall or just disable all of them in the Extensions app, then log out and log in again. Does the problem still occur? If so then it might be this: https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/3098 ** Bug watch added: gitlab.gnome.org/GNOME/gnome-shell/-/issues #3098 https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/3098 ** Changed in: gnome-shell (Ubuntu) Status: New => Incomplete ** Tags added: performance ** Tags added: regression-release ** Also affects: gnome-shell via https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/3098 Importance: Unknown Status: Unknown -- 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/1904819 Title: gnome-shell uses 100% cpu when screen blanked Status in GNOME Shell: Unknown Status in gnome-shell package in Ubuntu: Incomplete Bug description: Recently I've noticed gnome-shell eating 100% of the CPU when the screen is blanked due to the session going idle. This seems to have started happening sometime after upgrading to groovy back when it was still in beta. ProblemType: Bug DistroRelease: Ubuntu 20.10 Package: gnome-shell 3.38.1-1ubuntu1 ProcVersionSignature: Ubuntu 5.8.0-25.26-generic 5.8.14 Uname: Linux 5.8.0-25-generic x86_64 ApportVersion: 2.20.11-0ubuntu50.1 Architecture: amd64 CasperMD5CheckResult: skip CurrentDesktop: GNOME Date: Thu Nov 19 17:04:37 2020 DisplayManager: gdm3 InstallationDate: Installed on 2018-08-13 (828 days ago) InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725) RebootRequiredPkgs: linux-image-5.8.0-26-generic linux-base linux-image-5.8.0-28-generic linux-base RelatedPackageVersions: mutter-common 3.38.1-1ubuntu1 SourcePackage: gnome-shell UpgradeStatus: Upgraded to groovy on 2020-09-24 (55 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/gnome-shell/+bug/1904819/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
