I just did an experiment where I used Settings -> Displays -> Mirror, and both 
screens displayed.
I then went back to Join and the 2nd went back to black.

I recreated this test 3 times, and each time I chose Mirror both  screens 
became visible in Mirror mode.
Each time I chose Join the 2nd screen went black.
The mouse cursor was still present, and moved between screens properly.

It can be hard to do this, as the "Keep these changes?" popup likes to appear 
on the black screen.
It helps if you start 2 or 3 large terminals, and move them over to the black 
screen before running settings, if that makes any sense.

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to mutter in Ubuntu.
https://bugs.launchpad.net/bugs/2089709

Title:
  Ubuntu 24.04 sometimes logs in to a black screen if the mouse is moved
  during login

Status in mutter package in Ubuntu:
  Fix Released
Status in mutter source package in Noble:
  Confirmed
Status in mutter source package in Oracular:
  Won't Fix
Status in mutter source package in Plucky:
  Fix Released
Status in mutter source package in Questing:
  Fix Released

Bug description:
  I recently upgraded from Ubuntu 22.04 to Ubuntu 24.04. Now whenever I
  log in, sometimes I'll get a blank screen. It will only show the mouse
  cursor as an X.

  The problem seems to be intermittent. So far it's only happened to me
  using X11.

  My current workaround:

  1. Open another terminal (e.g. Ctrl+Alt+F6)
  2. Restart gdm3 (sudo systemctl restart gdm3)

  This seems to be affecting many people, although I couldn't find an
  existing bug: https://askubuntu.com/questions/1514757/issue-with-
  ubuntu-24-04-black-screen-with-cursor-on-login

  $ lsb_release -rd
  No LSB modules are available.
  Description:  Ubuntu 24.04.1 LTS
  Release:      24.04

  $ apt-cache policy gdm3
  gdm3:
    Installed: 46.0-2ubuntu1
    Candidate: 46.0-2ubuntu1
    Version table:
   *** 46.0-2ubuntu1 500
          500 http://ca.archive.ubuntu.com/ubuntu noble/main amd64 Packages
          100 /var/lib/dpkg/status

  ProblemType: Bug
  DistroRelease: Ubuntu 24.04
  Package: gdm3 46.0-2ubuntu1
  ProcVersionSignature: Ubuntu 6.8.0-48.48-generic 6.8.12
  Uname: Linux 6.8.0-48-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.28.1-0ubuntu3.1
  Architecture: amd64
  CasperMD5CheckResult: unknown
  CurrentDesktop: ubuntu:GNOME
  Date: Tue Nov 26 14:54:33 2024
  InstallationDate: Installed on 2020-04-24 (1677 days ago)
  InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
  SourcePackage: gdm3
  UpgradeStatus: Upgraded to noble on 2024-11-15 (11 days ago)
  modified.conffile..etc.default.apport: [modified]
  modified.conffile..etc.init.d.apport: [modified]
  mtime.conffile..etc.default.apport: 2020-05-04T10:55:44.853443
  mtime.conffile..etc.gdm3.custom.conf: 2022-09-08T08:54:17.642371
  mtime.conffile..etc.init.d.apport: 2024-07-22T10:59:07

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