The pattern of corruption looks like a pixel format mixup or colour
channel overflow. So I would bet it's related to the 10-bit/8-bit colour
changes in Mesa and Mutter...

I can't reproduce it on my desktop (Haswell, 10-bit monitor).
I can reproduce it on two laptops (Kaby Lake, 8-bit panels).

Is the problem Ubuntu-specific? I've been wondering if our mesa
patch(es) in this area are still necessary (since mutter fixed their
side, didn't they?).

** Also affects: xorg-server (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: xorg-server (Ubuntu)
       Status: New => Confirmed

** Tags added: visual-quality

** Changed in: gnome-shell (Ubuntu)
   Importance: Undecided => Medium

** Changed in: mesa (Ubuntu)
   Importance: Undecided => Medium

** Changed in: mesa (Ubuntu)
       Status: Incomplete => Confirmed

** Changed in: mutter (Ubuntu)
   Importance: Undecided => Medium

** Changed in: xorg-server (Ubuntu)
   Importance: Undecided => Medium

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Desktop Bugs, which is subscribed to mutter in Ubuntu.
https://bugs.launchpad.net/bugs/1753776

Title:
  Graphics corruption (or distortion?) in login animation to Xorg
  sessions

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