Hello all,

I'm on a Lenovo T400 laptop. I was hoping someone around here would know much about defining, configuring, and applying profiles for scaling the CPU frequency. Does anyone know much about doing this with KDE?

In the past I usually used Fluxbox with cpufrequtils and cpufreqd to modify frequency settings. However in KDE, the "Guidance" power manager loads up.

Unfortunately there's only one choice: "dynamic".

Checking the system settings in KDE I see that there is a Power Management settings tool. In the profiles section they allow you to modify the CPU frequency scaling as well, but even here they only give a choice between "dynamic" and "userspace."

Anyone know much about it?

Any help would be appreciated. Thanks,
Coto

CPU frequency scaling is enabled by default in Slackware 13 if you're using a laptop with a battery.

'ondemand' appears to be the default governor in /etc/rc.d/rc.modules which sounds like the same thing as 'dynamic'. It should make use of EIST for Intel and Powernow! for AMD with no user intervention. It will scale according to workload. 'userspace' is for defining speed scaling manually. You can set up a cpufreqd.conf file if you use userspace governor afaik.

If you have freq_table and the right module for your processor (exowernow_k8 for AMD) loaded, you just need to load:

/sbin/modprobe cpufreq_powersave
/sbin/modprobe cpufreq_performance
/sbin/modprobe cpufreq_conservative

You can change by command line too. My processor scales better with conservative, so typing 'echo "conservative" > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor', I have better balanced results. You can change by frequencies too (ex: echo 2000000 > /sys..). Look at your system and try to find your values and governors. Maybe you have cpufreq_stats built and can collect some nice readings.