SUMMARY I frequently/daily experience freezes where nothing responds and the clock doesn't count seconds. These freezes are for about 3-4 seconds. Happens maybe 3 times a day. I was using Kubuntu 20.04 LTS before but clean reinstalled to Kubuntu 21.04 and started to use Wayland from day 1. The last two times the freezes occured were: 1. When i clicked to open the Application Launcher. Freezed for two seconds and only then opened it. From then on it opens instantly 2. When i opened a new tab in Dolphin and then switched to it and tried to open one folder. Whole UI freezed for maybe 5 seconds and only then opened the folder. When i pressed Win + D to switch to Desktop i think it worked but i'm not sure whether it was while it was freezed or after that. I have a CPU and memory widgets on the desktop and immediately after i switched to desktop they were showing 75% RAM and 46 % CPU. I use linux-lowlatency and the bfq io scheduler, also zram and btrfs. Before i was on 20.04 with linux-lowlatency and the bfq io scheduler and zram + ext4. That makes me feel it's either a Wayland/KWin issue or a btrfs one. But i doubt btrfs can have such a big impact. I am open to suggestions how to help you diagnose this. STEPS TO REPRODUCE Happens randomly, always after a click from me with the mouse. OBSERVED RESULT Freeze EXPECTED RESULT No freeze SOFTWARE/OS VERSIONS Operating System: Kubuntu 21.04 KDE Plasma Version: 5.22.0 KDE Frameworks Version: 5.82.0 Qt Version: 5.15.2 Kernel Version: 5.11.0-18-lowlatency (64-bit) Graphics Platform: Wayland Processors: 8 × Intel® Core™ i5-8250U CPU @ 1.60GHz Memory: 7,6 GiB of RAM Graphics Processor: Mesa Intel® UHD Graphics 620
I should mention that i missed to say that there were no such freezes with my 20.04 X.Org configuration described above.
>I am open to suggestions how to help you diagnose this. If we're seeing a CPU spike, a record from hotspot would be good.
Could you check whether you can reproduce the issue on Xorg with your new system configuration? That will tell us at least whether it's a btrfs issue or a KWin/Wayland issue.
Dear Bug Submitter, This bug has been in NEEDSINFO status with no change for at least 15 days. Please provide the requested information as soon as possible and set the bug status as REPORTED. Due to regular bug tracker maintenance, if the bug is still in NEEDSINFO status with no change in 30 days the bug will be closed as RESOLVED > WORKSFORME due to lack of needed information. For more information about our bug triaging procedures please read the wiki located here: https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging If you have already provided the requested information, please mark the bug as REPORTED so that the KDE team knows that the bug is ready to be confirmed. Thank you for helping us make KDE software even better for everyone!
This bug has been in NEEDSINFO status with no change for at least 30 days. The bug is now closed as RESOLVED > WORKSFORME due to lack of needed information. For more information about our bug triaging procedures please read the wiki located here: https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging Thank you for helping us make KDE software even better for everyone!