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CPU power management support has improved in 5.8. Better ACPI support and the drivers now use more lower-power C states.

"acpicpu(4) uses ACPI C-state information to reduce power consumption of idle CPUs. "

That's great to hear! I'll definitely give it a try!

What C states does it currently support? My FreeBSD box spends most of its time in C8.

As I understand previously only C1 was used. The range has been expanded now though you'd have to read the code to see exactly what it's doing.

It seems to produce acceptable power draw figures on a ThinkPad X250 in any case.