Extremely visible screen tearing with VLC and Firefox/Chromium

[Pedro Côrte-Real]

When watching videos in VLC on an external screen there is extremely visible screen tearing. But it's likely that the external screen only makes the problem worse as this website shows a lot of vsync issues in both Firefox and Chromium even with just the single screen:

https://www.vsynctester.com/

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: mutter 3.28.3-2~ubuntu18.04.2
ProcVersionSignature: Ubuntu 4.15.0-43.46-generic 4.15.18
Uname: Linux 4.15.0-43-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.5
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Sun Dec 30 23:16:26 2018
InstallationDate: Installed on 2018-05-31 (213 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
SourcePackage: mutter
UpgradeStatus: No upgrade log present (probably fresh install)

[Pedro Côrte-Real (pedrocr)]

This seems to at least help:

https://extensions.gnome.org/extension/1445/fix-fullscreen-tearing/

Maybe something like that should be shipped by default

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.