right, from the top then:

If you have installed rootsh then either or will effectively give you root access, ie; make you superuser, whatever you want to call it.

Then go for and Xterm will then install kernel-power as a dependency.

Once you are all installed close and open Xterm again and go for the following. Replace (lower) and (higher) with numbers, would suggest 250 700 to start and then move up in increments of 50 on the higher setting. I run mine at 250 1000.

Then you can load the voltage profiles - ideal (ideal, obviously), lv (low voltage), xlv (extra low voltage), and ulv (ultra low voltage);

Test them with processor intensive tasks - youtube is good, gaming is another good one, and when it gets unstable revert back to the previous setting.

Once you have a setting you like you can save it to a profile;

Where (name) is whatever you want to call the profile. You can then load the profile on call

Or even set it to load on boot of your device;

Have fun.