OK so multiple problems there, which may have the same root cause:

* Your shell/compositor seems to be causing stalling.

* vulkaninfo says your GPU is "not using the AMDGPU kernel driver:
Invalid argument (VK_ERROR_INCOMPATIBLE_DRIVER)"

Sounds fundamentally like the kernel graphics driver isn't working.
Please try the supported Ubuntu kernel instead.

Also what desktop environment is this?

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https://bugs.launchpad.net/bugs/1975566

Title:
  radeon / amdgpu bad performance or panics

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