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How to configure Ubuntu 12.04 Server to dynamically adjust CPU frequency during quiet times?

I've found a set of instructions at http://ubuntuforums.org/showthread.php?t=944190, suggesting to add acpi-cpufreq to /etc/modules, modprobe it, and then put one of (powersave, performance, ondemand, conservative) into the /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor files.

But on my system, those files don't exist:

user@pc:~$ ls /sys/devices/system/cpu/cpu0/
cache        microcode  subsystem         topology
crash_notes  power      thermal_throttle  uevent

There's an empty directory at /sys/devices/system/cpu/cpufreq, but

user@pc:~$ sudo echo conservative > /sys/devices/system/cpu/cpufreq/scaling_governor

gives error:

-bash: /sys/devices/system/cpu/cpufreq/scaling_governor: No such file or directory

Intel Atom CPU, if that makes a difference.

share|improve this question
What kind of Intel Atom do you have ? As far as I remember most of the Atoms don't support SpeedStep. –  b13n1u Jan 18 '14 at 23:12
Atom D2550 apparently, part of a Jetway JNC9KDL-2550 motherboard. It's potentially a fanless passively-cooled computer, if we can convince the CPU to quieten-down while not in use. –  OJW Jan 18 '14 at 23:54
According to intel it does not support SpeedStep. It's maximal TDP is 10W so most probably Intel decided to remove this feature. –  b13n1u Jan 19 '14 at 9:22

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