Note that tearing on all-but-one monitor in Xorg sessions is expected.
It's an unfortunate feature of Xorg with DRI2. If you can convince the
system to use DRI3 and TearFree then that avoids it. But that feature
also doesn't exist for all graphics drivers.
Please run:
lspci -k > lspcik.txt
and attach 'lspcik.txt' as well as your
$HOME/.local/share/xorg/Xorg.0.log
** Changed in: xorg-server (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1853094
Title:
Screen tearing in xorg gnome session on Latitude 7480 with WD19TB
Thunderbolt dock
Status in xorg-server package in Ubuntu:
Incomplete
Bug description:
I have the WD19TB Thunderbolt dock connected to a Dell Latitude 7480
laptop with two external displays. The laptop itself is closed
(internal display is not used).
In a gnome xorg session, there is severe tearing on parts of the
screen when dragging windows or scrolling content.
Under a wayland session there is no screen tearing, but I have
keyboard key repetition problems which make this mostly unusable day-
to-day
(https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/1849405).
I can supply short phone videos of tearing occurring on the screens if
required.
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: mutter 3.28.4-0ubuntu18.04.2
ProcVersionSignature: Ubuntu 5.0.0-36.39~18.04.1-generic 5.0.21
Uname: Linux 5.0.0-36-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.9
Architecture: amd64
CurrentDesktop: GNOME
Date: Tue Nov 19 14:02:09 2019
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_AU.UTF-8
SHELL=/bin/bash
SourcePackage: mutter
UpgradeStatus: No upgrade log present (probably fresh install)
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