It appears you are using graphics packages from the 'oibaf' PPA, which
is not supported and is known to be buggy.
Please remove that PPA from your system and if the problem persists then
open a new bug.
** Changed in: xorg (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1875073
Title:
Screen flickering in Kubuntu 20.04 on Lenovo Yoga C940 14-IIL
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