Cannot get CPU Frequency Scaling to work.

Posted on 2011-04-23
Last Modified: 2013-11-15
Many months ago, i removed powernowd from the mythbuntu installation as I didnt think it was needed.

Now, which the start of some hot weather, I'm thinking that running CPU Frequency Scaling will help to reduce the amount of heat this machine produces, which is A LOT!

So, I've done sudo apt-get install powernowd, but when i run sudo /etc/init.d/powernowd start, i get no errors, but there is no powernowd in the process list.

So I then tried sudo apt-get install cpufreqd cpufrequtils xfce4-cpufreq-plugin.

When running sudo cpufreq-info i get

cpufrequtils 005: cpufreq-info (C) Dominik Brodowski 2004-2006
Report errors and bugs to, please.
analyzing CPU 0:
  no or unknown cpufreq driver is active on this CPU
analyzing CPU 1:
  no or unknown cpufreq driver is active on this CPU

My CPU is an Intel Core 2 Duo E4300 1.8GHz, running Mythbuntu 9.10 (Karmic)
Question by:davepusey
    LVL 76

    Expert Comment

    Below is an example of how to set the min/max frequency from the above link:
    echo 825000 >/sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq
    echo 2200000 >/sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq
    You need to repeat the same for CPU1.
    LVL 2

    Accepted Solution

    It turns out that SpeedStep was disabled in the BIOS.

    Works perfectly now.
    LVL 2

    Author Closing Comment

    Self solved

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