Thanks for the bug report. This sounds like gnome-shell has crashed and
is being restarted:

> Whilst it is blanking, any running applications show their windows
(which is not usual) but it appears gnome-shell and the window manager
are not running (no dash and no window decorations).

When gnome-shell crashes the apps are still running on the bare Xorg
server so it looks different.

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https://bugs.launchpad.net/bugs/1881212

Title:
  Blank Screen initiates then fails

Status in Ubuntu:
  Incomplete

Bug description:
  Blank Screen initiates after timeout (usually 5 minutes but set to 1
  minute to replicate this bug), screen goes blank on both laptop and
  external Dell, but immediately comes back on. Whilst it is blanking,
  any running applications show their windows (which is not usual) but
  it appears gnome-shell and the window manager are not running (no dash
  and no window decorations).

  Disconnecting external monitor exhibits the same Blank Screen failure
  on the laptop screen.

  I have turned Automatic Screen Lock off for now to remove that as a
  cause.

  I have also had intermittent failure of gnome-shell.

  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
  Architecture: amd64
  BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
  CasperMD5CheckResult: skip
  CompositorRunning: None
  CurrentDesktop: ubuntu:GNOME
  Date: Fri May 29 09:07:11 2020
  DistroCodename: focal
  DistroVariant: ubuntu
  DkmsStatus:
   v4l2loopback, 0.12.3, 5.4.0-31-generic, x86_64: installed
   v4l2loopback, 0.12.3, 5.4.0-33-generic, x86_64: installed
   virtualbox, 6.1.6, 5.4.0-31-generic, x86_64: installed
   virtualbox, 6.1.6, 5.4.0-33-generic, x86_64: installed
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Intel Corporation UHD Graphics 620 (Whiskey Lake) [8086:3ea0] (rev 02) 
(prog-if 00 [VGA controller])
     Subsystem: Lenovo UHD Graphics 620 (Whiskey Lake) [17aa:2292]
  InstallationDate: Installed on 2020-02-25 (93 days ago)
  InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
  MachineType: LENOVO 20QFCTO1WW
  ProcEnviron:
   LANGUAGE=en_AU:en
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_AU.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.4.0-33-generic 
root=/dev/mapper/vgubuntu-root ro quiet splash vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: Upgraded to focal on 2020-05-01 (27 days ago)
  dmi.bios.date: 03/18/2020
  dmi.bios.vendor: LENOVO
  dmi.bios.version: N2HET47W (1.30 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20QFCTO1WW
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0J40697 WIN
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 31
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.modalias: 
dmi:bvnLENOVO:bvrN2HET47W(1.30):bd03/18/2020:svnLENOVO:pn20QFCTO1WW:pvrThinkPadX1Yoga4th:rvnLENOVO:rn20QFCTO1WW:rvrSDK0J40697WIN:cvnLENOVO:ct31:cvrNone:
  dmi.product.family: ThinkPad X1 Yoga 4th
  dmi.product.name: 20QFCTO1WW
  dmi.product.sku: LENOVO_MT_20QF_BU_Think_FM_ThinkPad X1 Yoga 4th
  dmi.product.version: ThinkPad X1 Yoga 4th
  dmi.sys.vendor: LENOVO
  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 20.0.4-2ubuntu1
  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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