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Re:RHEL is deprecating KDE by simion314 on Saturday November 03, 2018 @08:24AM (#18369868)
I never hear of this issue, if you want to try again open a bug or ask for help on reddit or support sites/forums. Most issues related to graphics are flickering and artifacts and KWin has many options you can try, including not using 3d effects. (Wayland is still not ready)
Re:RHEL is deprecating KDE by AsyncAwait on Saturday November 03, 2018 @12:53PM (#18371181)
I'll definitely try to isolate this more and file a bug report, I currently only use KDE actively on my Intel GPU laptop, but I like the DE itself very much and would like to switch to it everywhere, potentially, in the future.
Re:RHEL is deprecating KDE by simion314 on Saturday November 03, 2018 @01:57PM (#18371522)
I would first try to set kwin rendering backend 1to Xrender, this uses the CPU and not OpenGL/GP so you can see if the OpenGL drivers are the issue. For me on NVIDIA control panel app I have more options for OpenGl and those helped me.

This page has some variables that let's you set some things and bypass kwin autodetection https://community.kde.org/KWin/Environment_Variables

I know it sucks that it does not work out of the box, at least you don't have Nvidia.