[Bug 253344] System hard resets when setting CPU frequency with Ryzen 2600

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253344

--- Comment #2 from Conrad Meyer <cem at freebsd.org> ---
Re: low idle power without powerd: most idle power-saving of Zen and newer CPUs
comes from entering C-states (which FreeBSD does automatically), rather than
lower-frequency P-states.

So, I don't know why the pstate-setting stuff doesn't work.  But I wouldn't
worry too much about just disabling powerd.

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