I've never seen this problem before. The only unusual thing I can see is
that you have a shiny new Whiskey Lake GPU, which means it's a newish
graphics driver path.
Can you please make a video of the problem on a phone or camera?
** Package changed: xorg (Ubuntu) => mutter (Ubuntu)
** Also affects: mesa (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1846201
Title:
Rendering is delayed on laptop display (works in external display)
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