cpudyn (http://mnm.uib.es/~gallir/cpudyn/)
By Ricardo Galli (gallir AT uib dot es)
Copyright: Ricardo Galli
Licence: GPL
CPU DYNAMIC FRECUENCY
This program control the speed in Intel SpeedStep, Pentium 4 Mobile and
PowerPC machines with the cpufreq compiled in the kernel or with ACPI
throttling support.
Tested with 2.4, Pentium 3 Speedstep Laptop (Dell Latitude), Pentium 4 Mobile Laptop (Dell Inspiron), Apple iBook, IBM Thinkpad.
I was tired of those complex programs that do everything but simply reduce the processor's speed when it's not needed and increase it to the maximun when it's really needed, as soon as possible.
So, I did it. It's not full of features (yes, I'll do it anyway) but it does very well what it has to do.
By using cpudyn you should not notice (well, almost) any performance impact, but nevertheless you should save battery consuption and reduce the temperature of your laptop.
DISKS STANDBY
Tired of playing with hdparm and /etc/apm to save battery in your laptop or
to make your desktop more quiet? Don't waste more time, you've found
the solution.
Since version 0.2.0, the program is also able to put the computer disks in standby mode, if a given period has passed without any I/O operation.
It works very well even with Journaled File Systems such as Ext3, XFS and ReiserFS.
Options "-t timeout" and "-h dev0[,dev1]..." control this behaviour. It is __not__ activated by default, -t or -h activated. Please check the usage and edit /etc/init.d/cpudyn if you need to activate it at startup time.
This feature only works with Linux 2.4.X, but is already prepared to be adapted for 2.5. Stay tuned.
Example:
cpudynd -i 1 -t 60 -h /dev/hda,/dev/hdc
MORE INFO
More info, in Spanish, at:
http://bulmalug.net/body.phtml?nIdNoticia=1748
Yes, I know I should do it also in English, if there are enough foreign users, I'll do it. It was just written to scratch my itch.
NOTE: at the current version, it behaves similarly when connected or not to the AC. But, is there any difference at all for most cases? You want your konqueror running as fast as always :-)