[Bug 249889] [cpufreq] does not seem to fully support AMD Ryzen 9 4900H

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=249889

--- Comment #3 from Conrad Meyer <cem at freebsd.org> ---
I don't think turboboost corresponds directly to P-states.  My understanding is
that turboboost/CPB can happen automatically any time the processor is in P0
(the nominal 3300 MHz state).

This is the same as on Zen+ and Zen1.

The hwpstate0 / Cool'n'Quiet driver is just the one that provides P-state
control:

    dev.cpu.0.freq_levels: 3300/4021 1700/1615 1400/1277

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