I found a solution for this, at least for my case! I traced the CPU
pinning to ACPI GPE11 (corresponding to IRQ9 in my Mac Pro 1,1) being
hit constantly.
This can be killed permanently by passing "acpi_mask_gpe=0x11" to the
kernel at boot.
I still believe this was first triggered for 20.04 first
I've seen many of the OP's symptoms too, including pinning one CPU at
100%. Makes the machine unusable. However I can be a little more precise
as to when they started:
- 20.04 was fine at first;
- 20.04 later under kernel 5.13-generic saw the problems start, at which
pointed I switched to low-lat
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