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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https://bugs.launchpad.net/bugs/1838644

Title:
  Booting into desktop results in flickering

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