Everything was running fine until this evening. Nothing obvious that could have triggered it.
I did not have any extensions in ~/.local/share/gnome-shell/extensions, so I disabled all of the ones found through gnome-extensions list --enabled. It reduced the CPU usage of the gnome-shell process a bit, but didn't change the overall high usage. I recorded a few seconds of CPU usage graph for the top 5 processes with high CPU load according to htop and plotted a graph using procpath (see attachment). You can see that multiple processes are affected and have insanely high CPU load. Processes are: 2447 - /usr/bin/pulseaudio 2589 - /usr/lib/xorg/Xorg 2771 - /usr/bin/gnome-shell 4641 - /snap/chromium/... 32369 - /usr/share/dbeaver-ce I killed all of them, including gnome-shell and X, but it didn't change the overall behaviour. Killing X (logging back in again after that), resulted in low CPU load across all 8 cores, but as soon as I started chromium it went up to 100% on all cores and stayed like that for at least 45 seconds. All while everything GUI related appears super laggy. My guess is, that something is faulty around X, maybe even at a lower level. ** Attachment added: "procpath plot" https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/2047696/+attachment/5737445/+files/cpu.svg -- 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/2047696 Title: [Lenovo ThinkPad E14 Gen 2] Entire system becomes laggy for unknown reason Status in gnome-shell package in Ubuntu: Incomplete Bug description: Similar to whats described in https://bugs.launchpad.net/ubuntu/+bug/2032847 the system became super laggy since yesterday. It seems like something fundamental is affected. It can happen for typing, switching between tabs in browser (chrome or firefox), VS code (switching tabs, code highlighting), opening and closing applications, opening a new tmux session. Everything takes super long. Starting chromium or vs code will result in 100% cpu usage on all 8 cores according to htop for many seconds until it settles to stay around 30 to 50% all the time. Even opening a new browser tab causes comparable CPU load. But the described behaviour also happens without running chromium or vs code. Restarting gnome shell or gdm3 doesn't help. Switching back to Wayland doesn't help, there I even get mouse freezing. In summary, it seems like something multiplies the CPU usage of a lot of different processes. I've never seen anything like that. Yesterday I thought it could be the SSD breaking, because even booting (only after restart) took very long. But fsck before booting didn't show any problems. A full shutdown made it go away yesterday, and it seemed it would only appear again when I get notifications from Slack running in chromium, so I disabled it and was able to finish the work day. Today it started out well, I switched Slack to Firefox. But then it appeared again and now a shutdown doesn't fix it anymore. I know, it sounds funny, but I'm out of ideas even to narrow the source of the problem down and I really need this machine to work for work. Since yesterday I updated a system package called gjs (manually, since it was held back in sudo apt upgrade), which seems to be related to gnome-shell, it appears with quite high CPU usage in htop. I attached the output of journalctl -b0 and memfree -h, as this was asked in the thread mentioned above. ProblemType: Bug DistroRelease: Ubuntu 22.04 Package: gnome-shell 42.9-0ubuntu2 ProcVersionSignature: Ubuntu 6.2.0-39.40~22.04.1-generic 6.2.16 Uname: Linux 6.2.0-39-generic x86_64 ApportVersion: 2.20.11-0ubuntu82.5 Architecture: amd64 CasperMD5CheckResult: unknown CurrentDesktop: ubuntu:GNOME Date: Fri Dec 29 13:21:03 2023 DisplayManager: gdm3 InstallationDate: Installed on 2022-03-28 (640 days ago) InstallationMedia: Ubuntu 20.04.4 LTS "Focal Fossa" - Release amd64 (20220223) ProcEnviron: TERM=screen-256color PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=de_DE.UTF-8 SHELL=/bin/bash RelatedPackageVersions: mutter-common 42.9-0ubuntu5 SourcePackage: gnome-shell UpgradeStatus: Upgraded to jammy on 2022-09-06 (478 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/2047696/+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
