I experienced the same display freezing issues, though I could not find
any logs related to the issue. It appeared as if the freezes never
happened from the logs. Then I installed the amdgpu drivers from the AMD
repo and... it got worse. Instead of just display freezes, audio and
input also froze during gameplay or even just watching YouTube videos.
This made me think that the issue might not be related to the GPU but to
the CPU (iGPU) instead. Researching again with that in mind, I found
others posting about similar issues:
https://bugs.launchpad.net/ubuntu/resolute/+source/linux/+bug/2149877,
https://discourse.ubuntu.com/t/micro-stutters-with-ubuntu-26-04-lts-on-
amd-hardware/84032, https://askubuntu.com/questions/1566352/problem-z-
ubuntu-26-04-lts.

There were several workarounds proposed. I decided the best and cleanest
way for me would be to upgrade the linux kernel from proposed 7.0.0-26.

So I did:

cat << EOF | sudo tee /etc/apt/sources.list.d/proposed.sources
Types: deb
URIs: http://archive.ubuntu.com/ubuntu
Suites: $(. /etc/os-release && echo $VERSION_CODENAME)-proposed
Components: main restricted universe multiverse
Signed-By: /usr/share/keyrings/ubuntu-archive-keyring.gpg
EOF
sudo apt update
sudo apt install -t resolute-proposed linux-generic

Official docu on how to enable proposed:
https://documentation.ubuntu.com/project/SRU/reference/enable-proposed/

This fixed the issue for me.

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https://bugs.launchpad.net/bugs/2150776

Title:
  Ubuntu 26.04 GNOME Wayland: random short display/presentation freezes
  on AMD RX 7900 XT while apps continue running

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