Please try an older kernel like:

https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.4.89/amd64/

** Tags added: radeon

** Summary changed:

- screen corruption after last update.
+ [radeon] Horizontal lines of screen corruption after last update.

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

** Also affects: linux (Ubuntu)
   Importance: Undecided
       Status: New

** No longer affects: xserver-xorg-video-ati (Ubuntu)

** Tags added: regression-update

** Also affects: mesa (Ubuntu)
   Importance: Undecided
       Status: New

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You received this bug notification because you are a member of Desktop
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https://bugs.launchpad.net/bugs/1911369

Title:
  [radeon] Horizontal lines of screen corruption after last update.

Status in linux package in Ubuntu:
  New
Status in mesa package in Ubuntu:
  New

Bug description:
  A clean install is fine if I don't take updates.  If I do take the
  updates and reboot then I get heavy video corruption.  This just
  started today.

  This is a dual boot system.  The windows system has no issues.
  Appears to be software and not a hardware issue.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: xorg 1:7.7+19ubuntu14
  ProcVersionSignature: Ubuntu 5.8.0-36.40~20.04.1-generic 5.8.18
  Uname: Linux 5.8.0-36-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.14
  Architecture: amd64
  BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
  CasperMD5CheckResult: skip
  CompositorRunning: None
  CurrentDesktop: ubuntu:GNOME
  Date: Tue Jan 12 21:18:27 2021
  DistUpgraded: Fresh install
  DistroCodename: focal
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Advanced Micro Devices, Inc. [AMD/ATI] Tahiti PRO [Radeon HD 7950/8950 OEM / 
R9 280] [1002:679a] (prog-if 00 [VGA controller])
     Subsystem: Advanced Micro Devices, Inc. [AMD/ATI] Tahiti PRO2 [Radeon HD 
7950 Boost] [1002:3000]
  InstallationDate: Installed on 2021-01-13 (0 days ago)
  InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
  MachineType: Hewlett-Packard HP Z420 Workstation
  ProcEnviron:
   LANGUAGE=en_CA:en
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_CA.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.8.0-36-generic 
root=UUID=e1d90a30-a65a-46c5-bae3-c39bbf1a4e0e ro quiet splash vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 10/29/2019
  dmi.bios.release: 3.96
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: J61 v03.96
  dmi.board.name: 1589
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: 0.00
  dmi.chassis.type: 6
  dmi.chassis.vendor: Hewlett-Packard
  dmi.modalias: 
dmi:bvnHewlett-Packard:bvrJ61v03.96:bd10/29/2019:br3.96:svnHewlett-Packard:pnHPZ420Workstation:pvr:rvnHewlett-Packard:rn1589:rvr0.00:cvnHewlett-Packard:ct6:cvr:
  dmi.product.family: 103C_53335X G=D
  dmi.product.name: HP Z420 Workstation
  dmi.product.sku: D8N02UC#ABA
  dmi.sys.vendor: Hewlett-Packard
  version.compiz: compiz N/A
  version.libdrm2: libdrm2 2.4.102-1ubuntu1~20.04.1
  version.libgl1-mesa-dri: libgl1-mesa-dri 20.2.6-0ubuntu0.20.04.1
  version.libgl1-mesa-glx: libgl1-mesa-glx N/A
  version.xserver-xorg-core: xserver-xorg-core 2:1.20.9-2ubuntu1.1~20.04.1
  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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