Kubuntu 18.04: Screen contents flicker on resize

[Apurv Jyotirmay]

I was trying out the Beta build of Kubuntu 18.04 LTS and I faced the same
issue I faced earlier with 17.10. When resizing any window, there are times
when it will flicker. It's random, and switching compositing backend to
openGL 3 didn't help either.
Using Xrender helped in removing the flicker, but then everything started
to tear. Even when I forced full screen repaints, the tearing wouldn't stop.

I don't know if it's a Xorg issue or something with KDE. I own a hardwared
powered by an Intel B920 Pentium chip with no dedicated graphics.

This issue wasn't there in 16.04, and if there's anything I can do to
generate more technical report, do let me know.
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