Created attachment 126360 [details] Video, demonstrating the effect SUMMARY Resizing windows causes entire screen to blink. STEPS TO REPRODUCE 1. Resize any opened window OBSERVED RESULT Entire screen blinks. EXPECTED RESULT No blinking. SOFTWARE/OS VERSIONS Operating System: Kubuntu 19.04 KDE Plasma Version: 5.15.4 KDE Frameworks Version: 5.56.0 Qt Version: 5.12.2 Kernel Version: 5.0.0-38-generic OS Type: 64-bit Processors: 8 × Intel® Core™ i5-8250U CPU @ 1.60GHz Memory: 7.7 GiB of RAM ADDITIONAL INFORMATION It seems that window opening is also affected.
Can you upgrade to Plasma 5.18 and see if it still happens?
I will try to upgrade to Plasma 5.18. In the meantime, I also checked my apt logs, and it seems that the issue appeared after upgrade from KDE 5.13.5 to 5.15.4.
Upgraded to KDE 5.16.5 (Kubuntu 19.10), the issue went away. I'll hold off upgrading to Kubuntu 20.04, which hasn't been released yet, but does have KDE 5.18.1.
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!
Nate Graham, please see my comment above about KDE 5.16.5.
If it's already fixed for you with 5.16.5, then let's close this. We can re-open it later if it recurs for you in 5.18 or any future version. Thanks!