Happens with the Dell XPS 9570 (Intel-Nvidia) as well on a fresh

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  lightdm does not greet or present login prompt when resuming from
  laptop suspend

Status in lightdm package in Ubuntu:

Bug description:
  Expected result: when opening laptop lid the lock screen presents
  itself so I can unlock my session

  Actual result: the contents of my desktop are visible (windows, etc)
  and I can move my mouse cursor around but I cannot interact with the
  desktop session at all. Hovering over UI elements or clicking them has
  no effect.

  In order to get the login prompt I have to ctrl+alt+f1, login at the
  console, and run sudo systemctl restart lightdm, then I can login
  normally and resume whatever I was doing from before I closed the
  laptop lid.

  ProblemType: Bug
  DistroRelease: Ubuntu 19.10
  Package: lightdm 1.30.0-0ubuntu1
  ProcVersionSignature: Ubuntu 5.3.0-23.25-generic 5.3.7
  Uname: Linux 5.3.0-23-generic x86_64
  ApportVersion: 2.20.11-0ubuntu8.2
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Sat Nov 23 09:08:32 2019
  InstallationDate: Installed on 2019-11-09 (14 days ago)
  InstallationMedia: Xubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
  SourcePackage: lightdm
  UpgradeStatus: No upgrade log present (probably fresh install)

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