Over at XYZ Computing they are trying to extend the battery life of a Fujitsu P7230, which with its 1.2GHz Intel Core Solo U1400 has an advantage.  What is at issue is the OS, Vista.  On a desktop C2D system, the resource demands of Vista are a minor annoyance but on a laptop system they are a real drain. They installed Ubuntu to give them a less needy OS, but ran into one problem, Fujitsu’s handy software battery life extender only works in Windows.  See how much they extended the life in the full article.
“In attempt to get the most possible from the P7230 I decided to completely remove Vista in favor of Ubuntu 7.04. This popular version of desktop Linux does not have manufacturer support from Fujitsu, but has a number of advantages over Vista, including a few that will be especially important to a notebook. Basically what I wanted from Ubuntu was an operating system that was less demanding on my hardware resources and would allow me to make the most of the notebook.”

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