resolved by removing iommu=soft option which was preserved from workaround of
bug https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1921995
now kernel boots fine and wayland session and amdgpu works fine
** Changed in: xorg (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1947453
Title:
wayland black screen with white flashes, display corruption, kernel
5.13
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