[Bug 225782] Ryzen: unable to set cpu freq

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=225782

--- Comment #1 from Conrad Meyer <cem at freebsd.org> ---
If this is also true on CURRENT, it looks like a buggy BIOS.  Your BIOS isn't
reporting P-states via ACPI or you would see a second positive number instead
of "/-1".  It's possible the BIOS bug also breaks P-state setting.  If a BIOS
update is available from your vendor, consider applying it.

If this works on CURRENT, great.  I don't support stable branches, so I would
just unsubscribe from this bug in that case.

In either case, I'd suggest rebooting and just not setting dev.cpu.0.freq
(leaving the machine in P0).  At idle, FreeBSD enters power-saving C-states and
won't consume any more power than if you were also downclocked.

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