[Debian-eeepc-devel] Installation of cpufrequtils

Paul Menzel paulepanter at users.sourceforge.net
Fri Sep 5 08:44:15 UTC 2008

Dear list,

a text search for cpufrequtils in the Debian Wiki just returned [1]
relating to the Eee PC. There it says to install cpufrequtils on the
EeePC 901.

I have an ASUS Eee PC 701 4G.

1. I thought, that the Intel(R) Celeron(R) M is doing the frequency
scaling by itself and that it is implemented in the hardware. Is that

2. If not, how to set it up? Trying to do it as in [2].

My question are written as comments in the next output.

$ sudo aptitude install cpufrequtils

Richte libcpufreq0 ein (004-2) ...
Richte cpufrequtils ein (004-2) ...
CPUFreq Utilities: Setting ondemand CPUFreq governor...disabled, governor not available...done.

$ # Contrary to [2] /etc/default/cpufrequtils does not exist.

$ less /usr/share/doc/cpufrequtils/README.Debian
$ sudo cp /usr/share/doc/cpufrequtils/examples/cpufrequtils.sample /etc/default/cpufrequtils
$ cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies 
112500 225000 337500 450000 562500 675000 787500 900000
$ cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors 
$ sudo modprobe cpufreq_ondemand # Do I have to add it to /etc/modules?

$ cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors 
ondemand performance
$ # Is this needed. [1] says acpi_cpufreq is sufficient.

$ sudo vim /etc/default/cpufrequtils # Adapt to the values shown.
$ sudo invoke-rc.d cpufrequtils stop
$ sudo invoke-rc.d cpufrequtils start
$ sudo invoke-rc.d cpufrequtils restart
$ # Why is there no output?

3. Should that be added to the FAQs or Configure?

Thanks a lot,


[1] http://wiki.debian.org/DebianEeePC/Model/901?highlight=%28cpufrequtils%29
[2] http://julien.danjou.info/blog/index.php/post/2008/08/13/Save-power-aka-easy-CPU-frequency-scaling
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