When starting up, dmesg reports

[17179575.060000] ACPI: CPU0 (power states: C1[C1] C2[C2])
[17179575.060000] ACPI: Processor [CPU0] (supports 16 throttling states)

In the proc directory my CPU is reported as

Intel(R) Celeron(TM) CPU 1200MHz stepping 01

which is alright. Obviously my CPU has 16 throttling states and two power states. All I want is that my CPU slows down when I do not need its performance - since the loud fan only stops in very cold rooms, and the CPU sometimes halts in summer. All attempts in loading the kernel modules failed (no such device).

What shall I do, what do I need? Can somebody give me an advice?

Thanks in advance,
Robert.

What modules have you tried?

Try:
If that works, try:

Oh, well, sorry, this was a bit inexact. Loading the cpufreq driver works, but nothing happens. Loading the cpu specific drivers does not work.

There is my first problem which I do not understand. Even though I can load any gouvenor like the cpufreq_ondemand, there will not be any directory

/sys/devices/system/cpu/cpu0/cpufreq/

just

/sys/devices/system/cpu/cpu0/

and I think that cpufreq_ondemand should create the subdirectory, not me manually.

Make sure the cpufreqd package is installed then put the cpufreq_ondemand on a line by itself in your /etc/modules just to make sure it loads on every boot now hopefully it works once the daemon is installed if not then reboot and see how it goes then.

Edit: You also have to make sure that you have enabled the power saving in your BIOS as well.

Okay, that was a good hint.

Obviously, there are two furhter modules load automatically, namely "processor" and "thermal". But the directory still does not exist, and the processor never seems to get slower.

At all, mbmon does not work.