"Some of the biggest issues are: Hard drive spin-downs,
interrupts, and power management. Figuring out how to make these
adjustments to your kernel (or subsystems) to gain a bit of extra
battery life would take more time googling than you would probably
prefer. Fortunately there is a single application available to take
care of this for you. Powertop is one of those tools every user of
Linux on a laptop should have installed – especially if your
laptop depends primarily on its battery for life.
"Powertop was created by Lesswatts.org with the sole purpose of
helping users find those programs and/or systems that are using too
much power. The end result? More battery life for you to enjoy.
Power top is easy to install and use. Powertop is a curses-based
application so it is run inside of a terminal very much like the
Top application. Don’t expect a fancy GUI here, it’s
text-based but still user-friendly. In this article you will find
out how to install Powertop and use it to get the most out of your
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