I should have added: I had tried the 5.12 kernel from https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.12/amd64/ and that was same (or worse, seemed to freeze quicker).
I should have added: I had tried the 5.12 kernel from /kernel. ubuntu. com/~kernel- ppa/mainline/ v5.12/amd64/
https:/
and that was same (or worse, seemed to freeze quicker).