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I have FreeBSD 9.0-RC3 installed on an HP Thin Client that has a Mobile AMD Sempron(tm) Processor 2100+. I am trying to get cpufreq and powerd to manage the frequency of the processor, but I'm not having any luck. Here's some lines from dmesg:

FreeBSD 9.0-RC3 #0: Sun Dec  4 08:56:36 UTC 2011
    root@farrell.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC amd64
CPU: Mobile AMD Sempron(tm) Processor 2100+ (997.52-MHz K8-class CPU)
  Origin = "AuthenticAMD"  Id = 0x60fc2  Family = f  Model = 6c  Stepping = 2
  AMD Features=0xea500800<SYSCALL,NX,MMX+,FFXSR,RDTSCP,LM,3DNow!+,3DNow!>
  AMD Features2=0x119<LAHF,ExtAPIC,CR8,Prefetch>

module_register: module cpu/ichss already exists!
Module cpu/ichss failed to register: 17
module_register: module cpu/est already exists!
Module cpu/est failed to register: 17
module_register: module cpu/hwpstate already exists!
Module cpu/hwpstate failed to register: 17
module_register: module cpu/p4tcc already exists!
Module cpu/p4tcc failed to register: 17
module_register: module cpu/powernow already exists!
Module cpu/powernow failed to register: 17

powerd: lookup freq: No such file or directory

Also, sysctl dev | grep freq returns no hits.

Any suggestions on how to get CPU frequency management working?

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up vote 1 down vote accepted

It looks as though there isn't any.

The FreeBSD forums folks have weighed in, and there's no support for CPU frequency management on this chip. AMD's spec sheet makes no mention of PowerNow, either.

This isn't surprising - small-form-factor boxes (like the T5730w; is that what you have?) are often built to run cool and low-power anyway. The Sempron 2100+ is 9W and built to be fanless, which fits that model.

If you're actually having heat issues, you might be able to replace a chassis fan or otherwise improve air flow, but I think the CPU's not going to cooperate.

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