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Old 06-04-2006, 04:05 AM   #1
Registered: Jun 2006
Distribution: Debian, Ubuntu, Windows XP
Posts: 146

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How can I know if my system supports ACPI and cpufreq?

I have an overheating problem with my compaq presario 2500 laptop (pentium 4 processor).

I tried recompiling my kernel with ACPI and cpufreq, but apparently it didn't work since I couldn't get cpufreqd nor powernowd to work.

#cat /proc/acpi/processor/CPU0/info

processor id: 0
acpi id: 0
bus mastering control: yes
power management: yes
throttling control: no
limit interface: no
Does that mean I can't regulate the frequency of my processor?

my kernel:
Old 06-04-2006, 06:26 AM   #2
Registered: Jun 2006
Distribution: Debian, Ubuntu, Windows XP
Posts: 146

Original Poster
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Problem solved.
I managed to install cpufreqd correctly with userspace as cpu_freq governor.

My problem was that I didn't know how to load the cpufreq modules, so I just built them directly into the kernel, along with ACPI and APM stuff.

Here's a very helpful link for frequency scaling:

(can't post URL because I don't have enough posts. ^^)

Now I'll try getting my ATI drivers to work, but that's another problem...
Old 11-07-2006, 05:12 PM   #3
LQ Newbie
Registered: Nov 2006
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If you have configured the cpufreq into the kernel. Linux provides an easy interface in the following directory:


If the "cpufreq" directory does not exist in your system, then either your distribution does not support such a interface or cpufreq is not well compiled into your kernel. I am using FC5 (&FC6) by the way.

If it exists, just "cd" to it and

$cat scaling_available_frequencies

which shows all the avialable frequencies.


$ cat > scaling_setspeed
<enter one of the available frequencies>
and do a Ctrl^D.

To check, if it has changed:

$cat scaling_cur_freq.

Hope this helps.



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