Video tearing on upgrade to 16.04

[Richard]

MacBook Pro two external displays via DisplayPort

Setup worked on 15.10

External display 3:
About 50% of mouse cursor entering this display: video shakes left-to-right when mouse cursor is on this display beginning from an shifting between 30% and 60% down from the top

Internal display 1:
The top bar flashes occassionally under the ,ouse cursor 30-60% down from the top

Occasional black squares popping up.

external display 2: works as expected

Kernel modules: i915
libwayland-server0 1.10.0-1~xenial0

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: gnome-shell 3.20.1-0ubuntu1~xenial1 [origin: LP-PPA-gnome3-team-gnome3-staging]
ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
Uname: Linux 4.4.0-21-generic x86_64
ApportVersion: 2.20.1-0ubuntu2
Architecture: amd64
Date: Tue Apr 19 16:01:27 2016
DisplayManager:

GsettingsChanges:

ProcEnviron:
 SHELL=/bin/bash
 TERM=xterm-256color
 PATH=(custom, user)
 LANG=en_US.UTF-8
 LANGUAGE=en_US.UTF-8
SourcePackage: gnome-shell
UpgradeStatus: Upgraded to xenial on 2016-04-19 (0 days ago)

[Richard (ismail-a)]

gnome shell wayland session

dpkg -s gnome-shell | egrep ^V
Version: 3.20.1-0ubuntu1~xenial1

[Richard (ismail-a)]

get-around seems to be:

move the cursor off the corrupt screen and back in until the shaking no longer appears.
It appears in around 50% of the cases when the mouse cursor enters the external display