Kernel Korner - Extending Battery Life with Laptop Mode

Economize on hard drive usage and extend your laptop's battery life.

Even though I don't have a laptop myself, I've had a lot of fun working on Laptop Mode. I want to acknowledge the efforts of the other guys who have contributed to Laptop Mode, including Jens Axboe, Micha Feigin, Andrew Morton and Kiko Piris. I also want to thank Jeroen Kruis for allowing me to abuse his brand-new PowerBook G4 for my experiments.

Resources for this article: /article/7647.

Bart Samwel initiated the effort to put Laptop Mode in Linux 2.6, even though he does not own a laptop. He studies Computer Science at Leiden University, The Netherlands, and earns his living writing proprietary software. He can be reached at



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Hi there, I found your blog

toplum's picture

Hi there, I found your blog via Google while searching and your post looks very interesting for me

Don't leave it in direct

Anonymous's picture

Don't leave it in direct sunlight, areas where it will be exposed to extreme temperatures such as car trunks
laptop asus

noatime is a superset of

Anonymous's picture

noatime is a superset of nodiratime, btw.

use it in the right way

Anonymous's picture

use your battery in the right,itis wrong to charging 12hours in the first time,go to the right site to change the laptop life

How To Extend Your Laptop's Battery Life

mrbattery's picture

Use the correct recharging procedure for your laptop. Only use the power cord that came with your laptop or an authorized replacement.
Follow correct maintenance for your battery when not in use. Don't leave it in direct sunlight, areas where it will be exposed to extreme temperatures such as car trunks.

Don't forget mount option "nodiratime"

Smedly McCharger's picture

This apparently was the missing piece to completely calm my laptop. With reiserfs or ext3, use mount options "noatime,nodiratime,notail". I had notail and noatime applied for years, but nodiratime stopped updates to directory inodes on reads. Glory!

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