FIXED!
In my case it seems I am victim of 2 converging issues, the 5.19 kernel & the original kernel param, mentioned right at the top of this thread: iommu=soft.
The marvellous & diligent Luc Raymond has once again come to the rescue for people with problematic Lenovo AMD. Those using kernel param iommu=soft should exchange it for amd_iommu=off
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