Windows flicker when resizing

[thoughton]

Yesterday I updated to Ubuntu 20.10 (from 20.04 LTS) and immediately noticed an issue with windows flickering when I resize them.

Here is a video demonstrating the issue: https://youtu.be/nNOoJWdDEes

This did not happen in 20.04.

Windows this has been noticed on include:

- Software & Updates (as shown in video)
- Tilix
- KeePassXC

Here is some information about my system:

- OS: Ubuntu 20.10 x86_64
- Host: XPS 13 9370
- Kernel: 5.8.0-40-generic
- Shell: bash 5.0.17
- Resolution: 1920x1080
- DE: GNOME 3.38.2
- WM: Mutter
- WM Theme: Adwaita
- Theme: Yaru-dark [GTK2/3]
- Icons: Yaru [GTK2/3]
- CPU: Intel i7-8550U (8) @ 4.000GHz
- GPU: Intel UHD Graphics 620
- Memory: 6139MiB / 15725MiB

Please let me know if there's any further details or diagnostics that would be useful.

Thank you.

ProblemType: Bug
DistroRelease: Ubuntu 20.10
Package: xorg 1:7.7+19ubuntu15
ProcVersionSignature: Ubuntu 5.8.0-40.45-generic 5.8.18
Uname: Linux 5.8.0-40-generic x86_64
.tmp.unity_support_test.0:

ApportVersion: 2.20.11-0ubuntu50.3
Architecture: amd64
CasperMD5CheckResult: skip
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: None
CurrentDesktop: GNOME
CurrentDmesg: Error: command ['pkexec', 'dmesg'] failed with exit code 126: Error executing command as another user: Request dismissed
Date: Wed Jan 27 00:23:33 2021
DistUpgraded: 2021-01-25 15:06:27,142 ERROR got error from PostInstallScript ./xorg_fix_proprietary.py (g-exec-error-quark: Failed to execute child process “./xorg_fix_proprietary.py” (No such file or directory) (8))
DistributionChannelDescriptor:
 # This is a distribution channel descriptor
 # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
 canonical-oem-somerville-xenial-amd64-20160624-2
DistroCodename: groovy
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes, if not too technical
GraphicsCard:
 Intel Corporation UHD Graphics 620 [8086:5917] (rev 07) (prog-if 00 [VGA controller])
   Subsystem: Dell UHD Graphics 620 [1028:07e6]
InstallationDate: Installed on 2018-02-01 (1090 days ago)
InstallationMedia: Ubuntu 16.04 "Xenial" - Build amd64 LIVE Binary 20160624-10:47
Lsusb:
 Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
 Bus 001 Device 002: ID 0489:e0a2 Foxconn / Hon Hai
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Lsusb-t:
 /: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/6p, 5000M
 /: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/12p, 480M
     |__ Port 7: Dev 2, If 0, Class=Wireless, Driver=btusb, 12M
     |__ Port 7: Dev 2, If 1, Class=Wireless, Driver=btusb, 12M
MachineType: Dell Inc. XPS 13 9370
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.8.0-40-generic root=UUID=04d2ce0b-b5d2-4184-93fc-428c29d5e2fd ro
SourcePackage: xorg
UpgradeStatus: Upgraded to groovy on 2021-01-25 (1 days ago)
dmi.bios.date: 05/25/2018
dmi.bios.release: 1.4
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.4.0
dmi.board.name: 0F6P3V
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 10
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvr1.4.0:bd05/25/2018:br1.4:svnDellInc.:pnXPS139370:pvr:rvnDellInc.:rn0F6P3V:rvrA00:cvnDellInc.:ct10:cvr:
dmi.product.family: XPS
dmi.product.name: XPS 13 9370
dmi.product.sku: 07E6
dmi.sys.vendor: Dell Inc.
version.compiz: compiz 1:0.9.14.1+20.10.20200813-0ubuntu1
version.libdrm2: libdrm2 2.4.102-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 20.2.6-0ubuntu0.20.10.1
version.libgl1-mesa-glx: libgl1-mesa-glx 20.2.6-0ubuntu0.20.10.1
version.xserver-xorg-core: xserver-xorg-core 2:1.20.9-2ubuntu1.2~20.04.1
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.6-2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-1ubuntu1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20200714-1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1
xserver.bootTime: Sun Dec 16 15:22:33 2018
xserver.configfile: default
xserver.errors:

xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 product id 5252
 vendor SHP
xserver.version: 2:1.18.4-0ubuntu0.8

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Daniel van Vugt (vanvugt)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. This particular bug has already been reported and is a duplicate of bug 1896627, so it is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Feel free to continue to report any other bugs you may find.