This is just (well mostly) curiosity, it doesn't seem to
affect anything that I know about, but during autoconfig,
the kernel (any 9.99.x I have tried I think) prints
acpi0: autoconfiguration error: failed to activate ACPI0007
64 times during the boot sequence (this one is from 9.99.105)
[...]
Before I actually counted, when I just watched them scroll past (very
quickly) during the boot, I guessed that it was perhaps once per CPU,
but 64 CPUs, no matter how you count them, is way more than I have,
so I doubt it is that.