This looks like a low level problem. So either in the kernel, or in the
Xorg driver.
Since you are using the old Xorg driver 'xserver-xorg-video-intel', I
first recommend removing that package or changing your Xorg config to
NOT use the 'intel' driver. Your system is easily new enough to use the
recommended 'modesetting' driver instead.
Please remove the 'intel' driver and retest. Then please run:
journalctl -b0 > journal.txt
and send us the file 'journal.txt'.
** Changed in: xorg-server (Ubuntu)
Status: New => Incomplete
** Package changed: xorg-server (Ubuntu) => xserver-xorg-video-intel
(Ubuntu)
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https://bugs.launchpad.net/bugs/1816231
Title:
There is regular screen flickering/flashing (when the mouse isn't
moving)
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