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I have recently bought this laptop with preinstalled ubuntu 12.04(64bit). Surprisingly it runs less than two hours in battery mode. But it runs around 4-4.30 hrs in windows7. I had noticed that all the dell laptop has short battery life in linux. I don't have any graphics card and also don't have any fan issue(constantly running). My question is why ubuntu can't give better lifetime for dell where almost all other laptop has better battery life in ubuntu than windows.

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marked as duplicate by Mitch, belacq, Kevin Bowen, Eric Carvalho, Basharat Sialvi Jun 25 '13 at 17:42

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Optimized driver. –  Web-E Jun 24 '13 at 12:16
    
@Nick I am talking about 3.2.0-23 kernel and a dell model which is specially supported by ubuntu. ASPM bug is no more in ubuntu 12.04 and newer. –  shantanu Jun 24 '13 at 12:37
    
Take a look at the excellent answer here. You may find some tips to improve battery life. –  user25656 Jun 24 '13 at 14:44

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