Public bug reported:

shortly after switching to kernel 5.8.0-50 on Apr 16, I got progressively worse 
display scrambling on all programs. Wrote to ubuntuforums.org Apr 19 but found 
no resolution. Thinking it was that kernel, I ran on 5.8.0-49 for a day without 
problem, then it too started the same display glitches. The problem progressed 
so far that I did a fresh system re-install on Apr 23. After, with the default 
kernel, 5.8.0-50, scrambling was worse than ever, almost unusable. Fortunately, 
the second kernel offered was 5.8.0-43. I have run on that kernel for 3 days 
now with no sign of the scrambling issue. 
The attached png shows static image corruption examples. The more dramatic 
strobing, spontaneous jumping from window to window, window re-mapping, video 
corruption etc., I was unable to capture.
Running Ubuntu 20.04.2 LTS

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: xorg 1:7.7+19ubuntu14
ProcVersionSignature: Ubuntu 5.8.0-43.49~20.04.1-generic 5.8.18
Uname: Linux 5.8.0-43-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.16
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CasperMD5CheckResult: skip
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Mon Apr 26 21:48:37 2021
DistUpgraded: Fresh install
DistroCodename: focal
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes, if not too technical
GraphicsCard:
 Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor Integrated Graphics 
Controller [8086:0412] (rev 06) (prog-if 00 [VGA controller])
   Subsystem: Dell Xeon E3-1200 v3/4th Gen Core Processor Integrated Graphics 
Controller [1028:0622]
InstallationDate: Installed on 2021-04-23 (3 days ago)
InstallationMedia: Ubuntu 20.04.2.0 LTS "Focal Fossa" - Release amd64 
(20210209.1)
MachineType: Dell Inc. Inspiron 3847
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.8.0-43-generic 
root=UUID=0fa2ade9-fdd6-4cfa-a153-0de2be1f39ae ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 06/29/2015
dmi.bios.release: 65.8
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A08
dmi.board.name: 088DT1
dmi.board.vendor: Dell Inc.
dmi.board.version: A01
dmi.chassis.type: 3
dmi.chassis.vendor: Dell Inc.
dmi.modalias: 
dmi:bvnDellInc.:bvrA08:bd06/29/2015:br65.8:svnDellInc.:pnInspiron3847:pvr:rvnDellInc.:rn088DT1:rvrA01:cvnDellInc.:ct3:cvr:
dmi.product.family: To be filled by O.E.M.
dmi.product.name: Inspiron 3847
dmi.product.sku: 0622
dmi.sys.vendor: Dell Inc.
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 2:1.20.9-2ubuntu1.2~20.04.2
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

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug corruption focal ubuntu

** Attachment added: "static corruption examples"
   
https://bugs.launchpad.net/bugs/1926248/+attachment/5492641/+files/joint%20scramble%20examples.png

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Touch seeded packages, which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1926248

Title:
  display scrambled - all packages

Status in xorg package in Ubuntu:
  New

Bug description:
  shortly after switching to kernel 5.8.0-50 on Apr 16, I got progressively 
worse display scrambling on all programs. Wrote to ubuntuforums.org Apr 19 but 
found no resolution. Thinking it was that kernel, I ran on 5.8.0-49 for a day 
without problem, then it too started the same display glitches. The problem 
progressed so far that I did a fresh system re-install on Apr 23. After, with 
the default kernel, 5.8.0-50, scrambling was worse than ever, almost unusable. 
Fortunately, the second kernel offered was 5.8.0-43. I have run on that kernel 
for 3 days now with no sign of the scrambling issue. 
  The attached png shows static image corruption examples. The more dramatic 
strobing, spontaneous jumping from window to window, window re-mapping, video 
corruption etc., I was unable to capture.
  Running Ubuntu 20.04.2 LTS

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: xorg 1:7.7+19ubuntu14
  ProcVersionSignature: Ubuntu 5.8.0-43.49~20.04.1-generic 5.8.18
  Uname: Linux 5.8.0-43-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.16
  Architecture: amd64
  BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
  CasperMD5CheckResult: skip
  CompositorRunning: None
  CurrentDesktop: ubuntu:GNOME
  Date: Mon Apr 26 21:48:37 2021
  DistUpgraded: Fresh install
  DistroCodename: focal
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes, if not too technical
  GraphicsCard:
   Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor Integrated Graphics 
Controller [8086:0412] (rev 06) (prog-if 00 [VGA controller])
     Subsystem: Dell Xeon E3-1200 v3/4th Gen Core Processor Integrated Graphics 
Controller [1028:0622]
  InstallationDate: Installed on 2021-04-23 (3 days ago)
  InstallationMedia: Ubuntu 20.04.2.0 LTS "Focal Fossa" - Release amd64 
(20210209.1)
  MachineType: Dell Inc. Inspiron 3847
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.8.0-43-generic 
root=UUID=0fa2ade9-fdd6-4cfa-a153-0de2be1f39ae ro quiet splash vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 06/29/2015
  dmi.bios.release: 65.8
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A08
  dmi.board.name: 088DT1
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A01
  dmi.chassis.type: 3
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: 
dmi:bvnDellInc.:bvrA08:bd06/29/2015:br65.8:svnDellInc.:pnInspiron3847:pvr:rvnDellInc.:rn088DT1:rvrA01:cvnDellInc.:ct3:cvr:
  dmi.product.family: To be filled by O.E.M.
  dmi.product.name: Inspiron 3847
  dmi.product.sku: 0622
  dmi.sys.vendor: Dell Inc.
  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 2:1.20.9-2ubuntu1.2~20.04.2
  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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