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In Windows, my battery lasts several hours. In Ubuntu 12.04, it's dead before an hour and a half.

I've installed but it has not solved the problem.

My power consumption looks like: powertop

The computer is a lenovo U400 with an ATI Radeon GPU.

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Have a look at this:Laptop battery optimization and maintenance – Mitch Aug 10 '12 at 19:51

You can try Jupiter which is a light weight power and hardware control applet. It says improves battery life and works to some extent for me.

To install jupiter do this.

sudo add-apt-repository ppa:webupd8team/jupiter
sudo apt-get update
sudo apt-get install jupiter

Hope this helps.

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