You have been subscribed to a public bug:
>From what I have read, this appears to be a lightdm bug. It will
occasionally resolve when switching managers and rebooting, but it's
inconsistent.
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: lightdm 1.26.0-0ubuntu1
ProcVersionSignature: Ubuntu 4.15.0-74.84-generic 4.15.18
Uname: Linux 4.15.0-74-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.9
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Wed Jan 22 09:41:13 2020
InstallationDate: Installed on 2019-01-07 (379 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
SourcePackage: lightdm
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: lightdm (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug bionic
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2 ports for 2 monitors, usb c port works, hdmi gives "NO SIGNAL" on monitor
https://bugs.launchpad.net/bugs/1860564
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