Using Ubuntu with KDE:


I don't understand how this works. There are many, many, many ways to do this, apparently, and at least some of them change form or method from one year to the next, or one distro to the next. Very, very, very frustrating.

Please help me to understand how:

1) cpufreq relates to cpufreqd

2) acpid relates to them both

3) to get my compaq N600c to scale!

I think I can help you with number 3. If you have the userspace cpufreq module compiled into your kernel, and you know what your proc is supposed to run at, you can (as root) do And you can check it with Here is a good link to check out.

i think i can help u in detail with the 2nd and 3rd point..

for the scaling.. first u need to make sure ur CPU supports frequency scaling..

- frequency scaling can be controlled automatically by a kernel module or a userspace application..

- the linux kernel includes different CPU speed governers.. these can be configured during kernel compilation .. and selected as modules..

- generally the governers available are..
- userspace
- ondemand
- conservative
- performance
- powersave

- for CPU speed scaling from user-space application.. u need to load the "userspace" governers..

- other governers generally are automically controlled..

- the easiest for u will be to use the "ondemand" or "conservative" governer , if it is available in the kernel..

- if u require finer control.. go for the "userspace" governer..

- in the case of "userspace" governer, u can use a userspace program such as "cpufreq-utils" or "cpufreqd" that can be configured to scale the frequency depending on input conditions..


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ACPID is not directly related to CPU scaling.. ACPID actually makes available to other applications the different ACPI events.. or can also be configured to take an action depending on particular ACPI events..

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in ur case.. what we can do is configure the "cpufreqd" to scale the frequency depending on ACPI events , such as temperature..

i suggest u use the "cpufreq-utils". go through its documentation to configure the configuration file and run the program..
i generally prefer to control the speed depending on:
- System load
- temperature
- ac power availability

all this can be done using "cpufreq-utils", with ACPI provinding temperature and ac-power information.

hope that helps.. sorry for the poor formatting.. i am in a hurry ;-)