You are so right, my apologies.
This bug report can be discarded.
In my efforts to get everything working on a new installation of Kubuntu
over the past few days, I unknowingly enabled the Intel driver for XOrg.
Unknowingly because: I assumed I was already using it. I put in a config
snippet in /etc/X11/xorg.conf.d/20-intel.conf in a (failed) attempt to
fix the screen brightness controls. This specifically links the PCI
address and the intel drivers. I now removed that file, re-installed
xserver-xorg-video-intel package and no flickering.
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https://bugs.launchpad.net/bugs/1872192
Title:
xserver-xorg-video-intel causes screen flickering in plasma on XPS 15
7590
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