We can often tell exactly what caused a freeze after rebooting and looking at the log of the previous boot where the freeze occurred.
Next time the freeze happens, please reboot and then in a Terminal window run: journalctl -b-1 > prevboot.txt and attach the resulting text file here. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to mutter in Ubuntu. https://bugs.launchpad.net/bugs/1912472 Title: Display freezes randomly - high CPU usage Status in mutter package in Ubuntu: Incomplete Bug description: Randomly, system freezes with high CPU usage (cooling fan goes high when the problem happens) since update to Ubuntu 20.04.1 LTS. Same problem with X11 and Wayland. Display freezes and keyboard or mouse inputs won't change anything. Caps and num lock won't react either. Ctrl+alt+anything doesn't solve the issue. Only possibility is then to force reboot using power button. After reboot, I could find in logs : gnome-shell libinput error: client bug: timer event6 debounce short: scheduled expiry is in the past (-15ms), your system is too slow Problem happens in any situation, for example while videoconferencing with any software, or using LibreOffice Writer, sometimes with Firefox. The only common fact seems to be that Firefox is always opened. ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: mutter 3.36.7+git20201123-0.20.04.1 ProcVersionSignature: Ubuntu 5.8.0-38.43~20.04.1-generic 5.8.18 Uname: Linux 5.8.0-38-generic x86_64 ApportVersion: 2.20.11-0ubuntu27.14 Architecture: amd64 CasperMD5CheckResult: skip CurrentDesktop: ubuntu:GNOME Date: Wed Jan 20 10:27:48 2021 InstallationDate: Installed on 2020-11-15 (65 days ago) InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731) ProcEnviron: TERM=xterm-256color PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=fr_FR.UTF-8 SHELL=/bin/bash SourcePackage: mutter UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/1912472/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
