[Bug 292615] cpufreq changes causes AMD 4750U to run 11x slower

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=292615

--- Comment #1 from Cy Schubert <cy@FreeBSD.org> ---
Created attachment 267335
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=267335&action=edit
Local patch to add tunable disabling CPPC.

I had a different problem, which I had sent a private email to aokblast and
lwhsu about. My email is copied here as it describes my problem:

Just an FYI, my Framework 13 with AMD CPU runs hot with this patch when 
performing buildworld. This is because I use powerd(8) to limit its 
frequency to 2200. This patch of course disallows powerd to control CPU 
frequency (as it should because PSTATE is incompatible with Cool`n'Quiet.

I've cobbled a simple patch to disable CPPC in loader.conf, restoring my 
desire to run my Framework 13 CPU at a maximum 2200 using powerd. Are you 
interested in the patch? If yes, I can either submit a phabricator revision 
or send it to you.

My Framework 13 with AMD Ryzen 7 7840U consistently ran at 98C to 100C
temperatures during buildworld and while building ports after the CPPC commit.
I applied a local patch that adds a tunable to disable CPPC. I use powerd to
limit the frequency of my Ryzen to 2200 MHz thereby reducing its temperature to
between 45C and 55C.

My local patch is attached.

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