I also notice you're not using the Ubuntu kernel. Please try the
standard Ubuntu kernel (5.4) as well as newer versions like 5.7-rc3 ...

https://kernel.ubuntu.com/~kernel-ppa/mainline/?C=M;O=D

** Package changed: xorg-server (Ubuntu) => xserver-xorg-video-amdgpu
(Ubuntu)

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https://bugs.launchpad.net/bugs/1875189

Title:
  [amdgpu] Screen Flickers when it wakes from suspend/sleep.

Status in linux package in Ubuntu:
  Incomplete
Status in mutter package in Ubuntu:
  Incomplete
Status in xserver-xorg-video-amdgpu package in Ubuntu:
  Incomplete

Bug description:
  I got some laptop having optimus/hybrid GPUs setup : AMD Vega 8 (
  Raven Ridge ) + Nvidia GTX 1650 GPUs and  a display having refresh
  rate of 120Hz.

  Whenever I shut the laptop lid or it auto-suspends it catches screen
  flickers when it wakes up.

  I think it's some kernel issue some deadlock maybe.

  I already filed a bug on fedora bugzilla forum for the same aswell.

  Here is the link for the same :

  https://bugzilla.redhat.com/show_bug.cgi?id=1748042

  I hope it gets' fixed this time :)

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: xorg 1:7.7+19ubuntu14
  Uname: Linux 5.6.0-7.1-liquorix-amd64 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: Sun Apr 26 20:33:46 2020
  DistUpgraded: Fresh install
  DistroCodename: focal
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes, if not too technical
  GraphicsCard:
   NVIDIA Corporation TU117M [GeForce GTX 1650 Mobile / Max-Q] [10de:1f91] (rev 
a1) (prog-if 00 [VGA controller])
     Subsystem: ASUSTeK Computer Inc. TU117M [GeForce GTX 1650 Mobile / Max-Q] 
[1043:109f]
   Advanced Micro Devices, Inc. [AMD/ATI] Picasso [1002:15d8] (rev c2) (prog-if 
00 [VGA controller])
     Subsystem: ASUSTeK Computer Inc. Picasso [1043:18f1]
  InstallationDate: Installed on 2020-04-26 (0 days ago)
  InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
  MachineType: ASUSTeK COMPUTER INC. TUF Gaming FX505DT_FX505DT
  ProcKernelCmdLine: audit=0  
BOOT_IMAGE=/@/boot/vmlinuz-5.6.0-7.1-liquorix-amd64 
root=UUID=c6a5aea4-fe87-480e-9b59-d3b0077d5842 ro rootflags=subvol=@ quiet 
splash vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 12/24/2019
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: FX505DT.310
  dmi.board.asset.tag: ATN12345678901234567
  dmi.board.name: FX505DT
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: No  Asset  Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: ASUSTeK COMPUTER INC.
  dmi.chassis.version: 1.0
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrFX505DT.310:bd12/24/2019:svnASUSTeKCOMPUTERINC.:pnTUFGamingFX505DT_FX505DT:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnFX505DT:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
  dmi.product.family: TUF Gaming
  dmi.product.name: TUF Gaming FX505DT_FX505DT
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK COMPUTER INC.
  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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