Earlier, the project went into hibernation as I had been busy with other things and we had also frozen changes to linux kernel. Now, with 3.0 released and things getting better and I have some freetime these days, I am hoping to finish powerbox soon (among many other things on my todo list).

Edit : Oh, I forgot to ask you what are your min/max scaling freq? BTW, ondemand is already compiled in linux kernel. So, 3.0 can do power management.

This issue is another topic that after much asking and researching I had documented in detail on the old forum.

Slitaz 3 might be a little different but I think I added these to the /etc/rcS.conf LOAD_MODULES line inside the quotes-

ac battery acpi-cpufreq cpufreq_ondemand

I think scaling only worked when unplugged (on battery).

I changed /etc/init.d/local.sh to scale on ac and add lesswatts.org scripts but I might comment out at least one of these scripts because sometimes something causes my hard drive to make frequent whirring sounds and I do not know if that is excessive startups-

#!/bin/sh
# /etc/init.d/local.sh - Local startup commands.
# All commands here will be executed at boot time.
#
. /etc/init.d/rc.functions

echo "Starting local startup commands... "

# Enable mobile CPU dynamic frequency scaling
modprobe acpi-cpufreq
modprobe cpufreq_ondemand
cd /sys/devices/system/cpu/cpu0/cpufreq
echo ondemand > scaling_governor
# if you have a dual core
cd /sys/devices/system/cpu/cpu1/cpufreq
echo ondemand > scaling_governor

# Enable laptop mode                                                                                           
    # When laptop mode is enabled, the kernel will try to be smart                                                 
    # about when to do IO, to give the disk and the SATA links as                                                  
    # much time as possible in a low power state.                                                                  

    if [ ! -e /proc/sys/vm/laptop_mode ] ; then
        echo "Kernel does not have support for laptop mode."
    else
        echo "Enabling laptop mode"
        echo 5 > /proc/sys/vm/laptop_mode
    fi

    # AC97 audio power saving mode                                                                                 
    # The AC97 onboard audio chips support power saving, where the                                                 
    # analog parts (codec) are powered down when no program is using                                               
    # the audio device.                                                                                            

    if [ -e /sys/module/snd_ac97_codec/parameters/power_save ] ; then
        echo "Enabling AC97 audio power saving mode"
        echo 1 > /sys/module/snd_ac97_codec/parameters/power_save
        echo 1 > /dev/dsp
    fi

    # The VM writeback time                                                                                        
    # The VM subsystem caching allows the kernel to group consecutive                                              
    # writes into one big write, and to generally optimize the disk IO                                             
    # to be the most efficient.                                                                                    

    if [ -e /proc/sys/vm/dirty_writeback_centisecs ] ; then
        echo "Writeback time set to 1500ms"
        echo 6000 > /proc/sys/vm/dirty_writeback_centisecs
    fi

# Lesswatts.org tricks
# Multicore scheduler http://www.lesswatts.org/tips/cpu.php
echo 1 > /sys/devices/system/cpu/sched_mc_power_savings
# Filesystem relatime http://www.lesswatts.org/tips/disks.php
mount -o remount,relatime /
# Hard disk power management http://www.lesswatts.org/tips/disks.php
hdparm -B 1 -S 12 /dev/sda
# Disable hal polling http://www.lesswatts.org/tips/disks.php
hal-disable-polling --device /dev/scd0
# Restart hal polling by commenting previous line and uncommenting next line http://www.lesswatts.org/tips/disks.php
# hal-disable-polling --device /dev/scd0 --enable-polling
# Disable WiFi radio RFkill http://www.lesswatts.org/tips/wireless.php
for i in `find /sys -name "rf_kill" ; do echo 1 > $i ; done  
# Restart WiFi by commenting previous line and uncommenting next line http://www.lesswatts.org/tips/wireless.php
# for i in `find /sys -name "rf_kill" ; do echo 0 > $i ; done  
# Disable gigabit http://www.lesswatts.org/tips/ethernet.php
ethtool -s eth0 autoneg off speed 100
# Enable gigabit by commenting previous line and uncommenting next line http://www.lesswatts.org/tips/ethernet.php
# ethtool -s eth0 autoneg on speed 1000

I rescued fragments of old forum material on adding additional power management to slitaz-

http://forum.slitaz.org/index.php/discussion/39/power-management-how-to/

@Jozee , my cpu is an atom 1.6 ghz .  But i would like to have it running at 200mhz when I'm doing nothing

The scripts reduced power on ac.

I forget how many of the lesswatts scripts worked.

The only potentially adverse behavior that I noticed was that some websites caused frequent hd whirring so it might be better not to do hd management.

Do not do gigabit kill or rfkill if you use gigabit or wifi.

200MHz is something you can dream - use powertop to find out your possible P-States and it depends what Atom you have - I think its a N270 and the Atom 270 P-States are (when my brain still remembers good):

Hi Kultex and Slicel

I've managed to lower the frenquencies on my eee 900A to 200 Mhz . But I'm not sure it lows the temperature ! Indeed, running applications just takes more time (as the amount of computation is the same) and there's never a state when the CPU is not busy (at least X serveur, lxpanel ...) . Beside this, I've read that Atom are clever and will in anytime lower freq if necessary.

So , actually my fan is broken :( And i wish to reduce max the heat of the CPU

I've read that lowerinf the VOLTAGE is the the thing to do. How can I do it yith Slitaz ?

Thx