Can you see if this bug still happens with the latest bionic kernel:
https://launchpad.net/~canonical-kernel-team/+archive/ubuntu/bootstrap/+build/14347009

To test this kernel, install both the linux-image and linux-image-extra
.deb packages.

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

** Tags added: needs-bisect

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

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https://bugs.launchpad.net/bugs/1749420

Title:
  Colour banding and artefacts appear system-wide on an Intel HD
  Graphics 4400 system

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