Created attachment 136220 [details] A blue tint appears when the Present Windows effect is active SCREEN RESOLUTION 5120 x 1440 SUMMARY On a ultrawide monitor, once the Present Window effect is activated and the mouse moved for the first time, a tint appears (blue in this case, but the color changes depending on the theme) over everything except the mouse cursor. The opacity of the tint changes when the mouse is moved from the left side of the screen (more) to the right (less). STEPS TO REPRODUCE 1. Go to System Settings -> Workspace Behavior -> Desktop Effects 2. Check Present Windows checkbox and click Apply 3. Move the mouse OBSERVED RESULT After moving the mouse a tint appears over everything except the mouse cursor. EXPECTED RESULT After moving the mouse a tint shouldn't appear. SOFTWARE/OS VERSIONS Linux/KDE Plasma: (available in About System) KDE Plasma Version: 5.21.1 KDE Frameworks Version: 5.79.0 Qt Version: 5.15.2 NVRM version: NVIDIA UNIX x86_64 Kernel Module 460.39 Thu Jan 21 21:54:06 UTC 2021 GCC version: gcc version 10.2.0 (GCC) ADDITIONAL INFORMATION This problem is fairly old and exists no matter the OS (currently on Arch Linux but was also present on Kubuntu).
I am having the same exact issue using a Nvidia RTX 3060 and a 2560x1440p screen. This problem does not exist whenever I switch to xrender instead of opengl. Operating System: Arch Linux KDE Plasma Version: 5.22.2 KDE Frameworks Version: 5.83.0 Qt Version: 5.15.2 Kernel Version: 5.12.12-169-tkg-bmq (64-bit) Graphics Platform: X11 Processors: 12 × AMD Ryzen 5 5600X 6-Core Processor Memory: 15.6 GiB of RAM Graphics Processor: NVIDIA GeForce RTX 3060/PCIe/SSE2
Should be fixed in the QML rewrite for Plasma 5.23!
I'm sorry to say but the problem persists after updating Plasma to 5.23.
(In reply to fmachado from comment #3) > I'm sorry to say but the problem persists after updating Plasma to 5.23. That's because it was never rewritten in 5.23, it will not be rewritten in 5.24 and probably not in 5.25. I have an ultrawide monitor too but don't have such problems... it must be something different.
This has been fixed with the rewrite in Plasma 5.25, done by Marco Martin with https://invent.kde.org/plasma/kwin/-/commit/376ee357dbc50fec3b6e71c40938171ddb2e726a!