Public bug reported:

I normally have a second monitor plugged into my laptop. Recently in
Ubuntu 18.04 (this is a regression that has happened in the last week or
so), when I boot the laptop I get presented with a blank login screen.
(The external monitor just shows the background screen, so it looks as
if gdm3 has hung or crashed.)

If I unplug the external monitor, gdm turns the primary screen back on
and I can log in.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: gdm3 3.27.90-0ubuntu1
ProcVersionSignature: Ubuntu 4.15.0-10.11-generic 4.15.3
Uname: Linux 4.15.0-10-generic x86_64
ApportVersion: 2.20.8-0ubuntu10
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Thu Mar  8 10:59:11 2018
InstallationDate: Installed on 2017-08-16 (203 days ago)
InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
SourcePackage: gdm3
UpgradeStatus: Upgraded to bionic on 2017-11-17 (110 days ago)

** Affects: gdm3 (Ubuntu)
     Importance: Undecided
         Status: New

** Tags: amd64 apport-bug bionic

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  gdm turns off the primary (login) monitor when two monitors are

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