[ubuntu] Improving battery life on my Asus U46e-Bal5

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http://ubuntuforums.org – I have my Asus U46e with an Intel coreI-5, 8GB ram running Ubuntu 12.04. Since installing I see that I am getting approximately 4 hours battery life and my brightness settings will not save. I was curious to find out whether I could extend the battery life on my laptop by tweaking the system. When running Windows, I found myself reaping the benefits of an 8-9 hour battery life and would like to get there if I could (Hardware)