Also on Ubuntu 18.04 i7-4790 with Intel Integrated Graphic Card.

I think this is not related to graphic card.

If you still want to use transparency from system theme, you can try
following:

1. Uncheck "Use transparency from system theme"
2. "Check Use tranparent background"
3. Re-check "Use transparency from system theme"

And the background will become stable with system theme transparency.

I guess gnome terminal sometimes mistakenly checking the grayed out "Use
transparent background" setting and disabled transparency, thus cause
the flickering.

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to gnome-terminal in Ubuntu.
https://bugs.launchpad.net/bugs/1726262

Title:
  17.10 - flickering overlay patterns in gnome-terminal

Status in gnome-terminal package in Ubuntu:
  Confirmed

Bug description:
  Clean install of Ubuntu 17.10.

  For gnome-terminal select color-scheme "black on light yellow".

  Overlay partly with e.g. Chrome (Browser) or Geany (editor). Then the
  border shadow of the e.g. Geany produces flickering extended shadows
  in the gnome-terminal. Foto with the extended shadows is attached.

  This bug was introduced with 17.10. This flickering didn't appear in
  17.04, 16.10, 16.04...

  Working as a developer with several open terminal windows on the
  desktop, this produces a disturbing desktop environment and mitigated
  by covering not used terminal windows complete with other apps.

  Haven't reproduced with other apps than gnome-terminal.

  Hardware
  Lenovo Thinkpad e330, cpu : Intel(R) Core(TM) i5-3210M CPU @ 2.50GHz
  gpu Builtin : HD 4000

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gnome-terminal/+bug/1726262/+subscriptions

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