How to make powertop suggestions permanent?

[mayoban]

Dear All,

In comparison to Windows Vista (average 4 hours) I only get a maximum of 3 hours battery life from my Lenovo Thinkpad R400 laptop when running Ubuntu 9.04.

As suggested in some other thread, I ran powertop to see, if I can reduce energy consumption. These where the the suggestions given:

• Enable SATA ALPM link power management via: echo min_power > /sys/class/scsi_host/host0/link_power_management_policy or press the S key.
  
• increase the VM dirty writeback time from 5.00 to 15 seconds with: echo 1500 > /proc/sys/vm/dirty_writeback_centisecs
  
• Enable laptop-mode by executing the following command: echo 5 > /proc/sys/vm/laptop_mode
  
• Enable USB autosuspend by pressing the U key or adding usbcore.autosuspend=1 to the kernel command line in the grub config
  
• Disable 'hal' from polling your cdrom with: hal-disable-polling --device /dev/cdrom 'hal' is the component that auto-opens a window if you plug in a CD but disables SATA power saving from kicking in.

I understand that powertop changes are confined to the active session. Does anyone know how I could make these changes permanent?

Thanks a lot for your help, mayoban

---
I am using Ubuntu 9.04, 64-bit version
on a Lenovo Thinkpad R400, Type 7439-A85
Gnome Desktop with Compiz Window Manager and Cairo-Dock

[binbash]

writing those commands to /etc/rc.local MAY do the trick.

[mayoban]

Hi binbash,

Thanks for your reply. I forgot one important question in the initial post:

How can I make sure, that the changes are only active, when the computer is in battery / laptop mode?

If I understand the purpose of rc.local correctly, changes would be enabled for all sessions.

Cheers, mayoban

[djurny]

take a look in /etc/pm/power.d if you have pm-utils installed..

[Axx83]

use laptop-mode instead:

http://ubuntuforums.org/showpost.php...50&postcount=3

[mayoban]

Thanks for the replies!

Re djurny: I checked and I do have pm-utils installed.

Re Axx83: I looked into the post. To me as a Linux beginner, it looks a little bit complicated. Given these instructions, I would not be knowing, what exactly I am doing. Do you know, if there may be a more elaborate explanation out there, or even a GUI for that purpose?

Cheers, mayoban

[durand]

use laptop-mode instead:

http://ubuntuforums.org/showpost.php...50&postcount=3

Thanks!

mayoban: It is really simple, just read the start of the files and you should get the idea.