based on my research so far (and summarized in the description), I don't
think this is an xorg issue.  I think it's a gnome issue.

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https://bugs.launchpad.net/bugs/1881687

Title:
  Desktop is blank after logging in without a monitor attached

Status in xorg package in Ubuntu:
  New

Bug description:
  On Ubuntu 20.04, I have an AMD system with an integrated GPU (Ryzen 3 3200G 
with Radeon Vega 8)
  I am using lightdm instead of gdm3. My GPU is using the amdgpu driver. I have 
no specific xorg.conf in place.  I am using x11vnc to login and view the 
desktop remotely.  There is no monitor attached.

  After logging into lightdm's greeter, I am presented with a blank
  desktop with the Focal Fossa background image and a mouse cursor, but
  no other visible interface or windows.  There is no menu bar at the
  top of the desktop and no application bar on the left.

  This all works perfectly fine if a monitor is attached before lightdm
  (and thus Xorg) is started.

  If I change the settings at login to use fvwm for my session it works
  fine.  This is also the case for Gnome Flashback mode (using
  metacity).  But the default of gnome-shell/mutter does not work
  without the monitor.  Nor does using Wayland.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: xorg 1:7.7+19ubuntu14
  ProcVersionSignature: Ubuntu 5.4.0-33.37-generic 5.4.34
  Uname: Linux 5.4.0-33-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.2
  Architecture: amd64
  CasperMD5CheckResult: skip
  Date: Sun May 31 13:34:20 2020
  DistUpgraded: Fresh install
  DistroCodename: focal
  DistroVariant: ubuntu
  DkmsStatus:
   evdi, 1.6.0+dfsg, 5.4.0-31-generic, x86_64: installed
   evdi, 1.6.0+dfsg, 5.4.0-33-generic, x86_64: installed
  ExtraDebuggingInterest: Yes, including running git bisection searches
  GraphicsCard:
   Advanced Micro Devices, Inc. [AMD/ATI] Picasso [1002:15d8] (rev c9) (prog-if 
00 [VGA controller])
     Subsystem: Advanced Micro Devices, Inc. [AMD/ATI] Picasso [1002:15d8]
  InstallationDate: Installed on 2020-05-21 (10 days ago)
  InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
  MachineType: Gigabyte Technology Co., Ltd. B450 I AORUS PRO WIFI
  ProcEnviron:
   TERM=screen-256color
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-33-generic 
root=UUID=0030bb65-9e5e-4a70-bba3-da14892ec5b9 ro quiet splash vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 11/27/2019
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: F50
  dmi.board.asset.tag: Default string
  dmi.board.name: B450 I AORUS PRO WIFI-CF
  dmi.board.vendor: Gigabyte Technology Co., Ltd.
  dmi.board.version: x.x
  dmi.chassis.asset.tag: Default string
  dmi.chassis.type: 3
  dmi.chassis.vendor: Default string
  dmi.chassis.version: Default string
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrF50:bd11/27/2019:svnGigabyteTechnologyCo.,Ltd.:pnB450IAORUSPROWIFI:pvrDefaultstring:rvnGigabyteTechnologyCo.,Ltd.:rnB450IAORUSPROWIFI-CF:rvrx.x:cvnDefaultstring:ct3:cvrDefaultstring:
  dmi.product.family: Default string
  dmi.product.name: B450 I AORUS PRO WIFI
  dmi.product.sku: Default string
  dmi.product.version: Default string
  dmi.sys.vendor: Gigabyte Technology Co., Ltd.
  version.compiz: compiz N/A
  version.libdrm2: libdrm2 2.4.101-2
  version.libgl1-mesa-dri: libgl1-mesa-dri 20.0.4-2ubuntu1
  version.libgl1-mesa-glx: libgl1-mesa-glx N/A
  version.xserver-xorg-core: xserver-xorg-core 2:1.20.8-2ubuntu2
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20200226-1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1

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