Full KMS hardware support is available in newer kernels (5.10.x I think)
so please try installing a newer arm64 kernel like:

https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.10.8/

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https://bugs.launchpad.net/bugs/1911030

Title:
  Graphical flashes on a raspi 4

Status in mesa package in Ubuntu:
  New
Status in xorg-server package in Ubuntu:
  New

Bug description:
  Using gnome-shell - activities - see attached video

  Graphics flash - more prominent with more than one app running.

  If you install ubuntu-budgie-desktop and simply move through the menu
  categories the flashing is even more prominent.

  I'm guessing this is xorg related - but I do note the recent mesa
  uplift has made things worse

  ProblemType: Bug
  DistroRelease: Ubuntu 21.04
  Package: xorg 1:7.7+19ubuntu15
  ProcVersionSignature: Ubuntu 5.8.0-1011.14+21.04.1-raspi 5.8.18
  Uname: Linux 5.8.0-1011-raspi aarch64
  ApportVersion: 2.20.11-0ubuntu55
  Architecture: arm64
  BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
  CasperMD5CheckResult: skip
  CompositorRunning: None
  CurrentDesktop: ubuntu:GNOME
  Date: Mon Jan 11 16:49:14 2021
  DistUpgraded: Fresh install
  DistroCodename: hirsute
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   
  ImageMediaBuild: 20201225
  Lspci-vt: -[0000:00]---00.0-[01]----00.0  VIA Technologies, Inc. VL805 USB 
3.0 Host Controller
  ProcKernelCmdLine: coherent_pool=1M 8250.nr_uarts=0 
snd_bcm2835.enable_compat_alsa=0 snd_bcm2835.enable_hdmi=1 
snd_bcm2835.enable_headphones=1 video=HDMI-A-1:640x480M@60 
smsc95xx.macaddr=DC:A6:32:D1:3E:28 vc_mem.mem_base=0x3ec00000 
vc_mem.mem_size=0x40000000  dwc_otg.lpm_enable=0 console=tty1 
root=LABEL=writable rootfstype=ext4 elevator=deadline rootwait fixrtc quiet 
splash
  SourcePackage: xorg
  UpgradeStatus: No upgrade log present (probably fresh install)
  acpidump:
   
  version.compiz: compiz N/A
  version.libdrm2: libdrm2 2.4.103-2
  version.libgl1-mesa-dri: libgl1-mesa-dri 20.3.2-1
  version.libgl1-mesa-glx: libgl1-mesa-glx N/A
  version.xserver-xorg-core: xserver-xorg-core 2:1.20.9-2ubuntu1
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-1ubuntu1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel N/A
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1

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