Public bug reported:

gnome-shell has the very interesting default of only doing virtual
desktops on the internal screen. This works fine but has a strange
visual glitch when changing virtual desktops where the contents of the
internal screen flash through the external one.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: gnome-shell 3.28.1-0ubuntu2
ProcVersionSignature: Ubuntu 4.15.0-22.24-generic 4.15.17
Uname: Linux 4.15.0-22-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.1
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Thu May 31 21:06:47 2018
DisplayManager: gdm3
InstallationDate: Installed on 2018-05-31 (0 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
SourcePackage: gnome-shell
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: gnome-shell (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic

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https://bugs.launchpad.net/bugs/1774498

Title:
  Windows flash by external screen on virtual desktop change

Status in gnome-shell package in Ubuntu:
  New

Bug description:
  gnome-shell has the very interesting default of only doing virtual
  desktops on the internal screen. This works fine but has a strange
  visual glitch when changing virtual desktops where the contents of the
  internal screen flash through the external one.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: gnome-shell 3.28.1-0ubuntu2
  ProcVersionSignature: Ubuntu 4.15.0-22.24-generic 4.15.17
  Uname: Linux 4.15.0-22-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.1
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Thu May 31 21:06:47 2018
  DisplayManager: gdm3
  InstallationDate: Installed on 2018-05-31 (0 days ago)
  InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
  SourcePackage: gnome-shell
  UpgradeStatus: No upgrade log present (probably fresh install)

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