Reproducing this:

$ xrandr -d :0.0 --output HDMI-A-0 --left-of eDP
$ xrandr -d :0.0 --output HDMI-A-0 --right-of eDP

No problem with:

$ xrandr -d :0.0 --output HDMI-A-0 --above eDP
$ xrandr -d :0.0 --output HDMI-A-0 --below eDP

The affected and unaffected laptops each have identical kernel log
entries about IRQ 7 and SADs count so I don't think those are related to
this.

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https://bugs.launchpad.net/bugs/1873895

Title:
  Regression: block staircase display with side-by-side monitors

Status in libxcb package in Ubuntu:
  New
Status in xserver-xorg-video-amdgpu package in Ubuntu:
  New

Bug description:
  Two identical Lenovo E495 laptops with 20.04 installed. The problem
  occurred initially on the laptop that is having package upgrades
  applied regularly.

  With dual monitors and the external monitor placed left or right the
  display has a blocked staircase effect shown in the attached
  photograph, and seems related to

  https://gitlab.freedesktop.org/xorg/driver/xf86-video-
  amdgpu/-/issues/10

  More detailed investigation suggests it only happens when the X
  coordinate of the two monitors is different. The symptom looks like an
  off-by-one error because it appears as if the display is divided into,
  say, 10 rows and 15 columns but the first row has 16 'columns' worth
  of blocks on it and so wraps to the beginning of the 2nd row, and so
  on.

  On the laptop without package upgrades being applied this didn't
  happen. So I upgraded it (314 packages) and restarted and it too sees
  the same problem.

  I suspected libxcomposite1 and downgraded it to 1:0.4.5-0ubuntu1 but
  that didn't solve it.

  I now suspect libxcb but so far haven't been able to prove it.
  --- 
  ProblemType: Bug
  ApportVersion: 2.20.11-0ubuntu27
  Architecture: amd64
  BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
  CasperMD5CheckResult: skip
  CompositorRunning: None
  CurrentDesktop: XFCE
  DistUpgraded: Fresh install
  DistroCodename: focal
  DistroRelease: Ubuntu 20.04
  DistroVariant: ubuntu
  GraphicsCard:
   Advanced Micro Devices, Inc. [AMD/ATI] Picasso [1002:15d8] (rev c1) (prog-if 
00 [VGA controller])
     Subsystem: Lenovo ThinkPad E595 [17aa:5124]
  InstallationDate: Installed on 2020-04-08 (11 days ago)
  InstallationMedia: Xubuntu 20.04 LTS "Focal Fossa" - Beta amd64 (20200408)
  MachineType: LENOVO 20NECTO1WW
  Package: xserver-xorg-video-amdgpu 19.1.0-1
  PackageArchitecture: amd64
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.4.0-21-generic 
root=/dev/mapper/ELLOE000-rootfs ro acpi_osi=! "acpi_osi=Windows 2016" quiet 
splash vt.handoff=7
  ProcVersionSignature: Ubuntu 5.4.0-21.25-generic 5.4.27
  Tags:  focal ubuntu ubuntu
  Uname: Linux 5.4.0-21-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip libvirt lp lpadmin lxd plugdev sambashare sudo users
  _MarkForUpload: True
  dmi.bios.date: 12/23/2019
  dmi.bios.vendor: LENOVO
  dmi.bios.version: R11ET32W (1.12 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20NECTO1WW
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Defined
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.modalias: 
dmi:bvnLENOVO:bvrR11ET32W(1.12):bd12/23/2019:svnLENOVO:pn20NECTO1WW:pvrThinkPadE495:rvnLENOVO:rn20NECTO1WW:rvrNotDefined:cvnLENOVO:ct10:cvrNone:
  dmi.product.family: ThinkPad E495
  dmi.product.name: 20NECTO1WW
  dmi.product.sku: LENOVO_MT_20NE_BU_Think_FM_ThinkPad E495
  dmi.product.version: ThinkPad E495
  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 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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