Public bug reported:

Dell Ultrasharp u2515H HDMI <-> HDMI Intel NUC
Xiaomi Mi Display 34" DP<->USB-C Intel NUC

When setting a second screen in portrait mode it creates artifacts,
checkerboard pattern on moving content on primary screen. If I set it
back to landscape there is no issue.

Multiple fresh installs, can recreate.
Used same setup on Windows and OSX, no issues.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: xorg 1:7.7+19ubuntu14
ProcVersionSignature: Ubuntu 5.4.0-47.51-generic 5.4.55
Uname: Linux 5.4.0-47-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.8
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CasperMD5CheckResult: skip
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Tue Sep  8 23:20:19 2020
DistUpgraded: Fresh install
DistroCodename: focal
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes, if not too technical
GraphicsCard:
 Intel Corporation Iris Plus Graphics 655 [8086:3ea5] (rev 01) (prog-if 00 [VGA 
controller])
   Subsystem: Intel Corporation Iris Plus Graphics 655 [8086:2074]
InstallationDate: Installed on 2020-09-08 (0 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
MachineType: Intel(R) Client Systems NUC8i3BEH
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-47-generic 
root=UUID=9e9839db-af37-4c9e-8ca4-ee3e0a9b7f77 ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 05/04/2020
dmi.bios.vendor: Intel Corp.
dmi.bios.version: BECFL357.86A.0081.2020.0504.1834
dmi.board.name: NUC8BEB
dmi.board.vendor: Intel Corporation
dmi.board.version: J72693-304
dmi.chassis.type: 3
dmi.chassis.vendor: Intel Corporation
dmi.chassis.version: 2.0
dmi.modalias: 
dmi:bvnIntelCorp.:bvrBECFL357.86A.0081.2020.0504.1834:bd05/04/2020:svnIntel(R)ClientSystems:pnNUC8i3BEH:pvrJ72753-303:rvnIntelCorporation:rnNUC8BEB:rvrJ72693-304:cvnIntelCorporation:ct3:cvr2.0:
dmi.product.family: Intel NUC
dmi.product.name: NUC8i3BEH
dmi.product.sku: BOXNUC8i3BEH
dmi.product.version: J72753-303
dmi.sys.vendor: Intel(R) Client Systems
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.101-2
version.libgl1-mesa-dri: libgl1-mesa-dri 20.0.8-0ubuntu1~20.04.1
version.libgl1-mesa-glx: libgl1-mesa-glx N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.20.8-2ubuntu2.4
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 focal ubuntu

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https://bugs.launchpad.net/bugs/1894903

Title:
  Changing orientation to portrait on second screend affects performance
  on primary screen, artifacts like

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