I can confirm that I have experienced this and it is most definitely related to Kernel 5 > If it clears in upward versions I can't say I did let Kubuntu 18.04 upgrade to 19.04 and the issue appeared. Switching KDE settings to xrender seemed to help, but it didn't remove the problem totally. I re-installed 18.04 and have been running it since, however, 18.04 just had the Kernel upgrade to 5 > I let it run, just to see, and sure enough, there it was again. So i just booted from the older installed kernel and all is well. So it's certainly Kernel related My graphics are: https://paste.ubuntu.com/p/jggjBGmS9x/
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