So it's ok that if I run powertop then it suggest me to disable xy, etc., but after I exit powertop, reboot the pc, and start it again[powertop], it brings up the same tips again! So how can I permanently save the suggestions of powertop?
Quick answer :
You just need to save them in /etc/rc.local
1) In a terminal run :
2) Step 1 generates a html file in your home directory. Click on that file so that it opens in your internet browser.
3) In the browser, go to "Tuning" tab. It gives all the tunings you have to tweak (on the left), and the commands that are implementing them (on the right).
4) Save these commands in /etc/rc.local
To do that, in a terminal, run :
Write the commands before the line that reads "exit 0", and save the file.
This doesn't exactly save your powertop settings, but it does come with its own defaults which enable almost every powertop setting. It's called laptop-mode-tools.
Just run "sudo apt-get install laptop-mode-tools" and run powertop, see if you like it. This also enables you to edit the settings, which in turn, edit the powertop settings.
You can edit the settings by typing in "sudo gedit /etc/laptop-mode/laptop-mode.conf" Maybe someone else knows how to save the settings "specifically" from powertop.
Here is a link for more information http://samwel.tk/laptop_mode/