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I have a Dell Latitude e6400 laptop and recently installed Ubuntu 12.04. Before, with Windows XP, my battery would charge to 100%.

Now, my battery charges to 29%. No matter how long I charge it.

Any advice?

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How old is your laptop and how much do you use it? It's possible the battery has just got old. Manufacturers only guarantee them for 6 months as they can degrade quite quickly. – StarNamer Jul 29 '12 at 19:45

I think this may be a known bug.

The bug is

The original reporter of the issue is running a Dell Inc. Latitude E6400, which is the same machine type and demonstrating the same situation you have described here.

Half an hour ago there was a new comment asking if there is any more information and if this is still a problem.

If you think it is the same issue you should help with this bug ticket It is quite old ( posted June 2011 ) and has had no updates since then so it will likely be closed if no new information is added.

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In comment 2 ( ) of the bug there is a lot of information to help you with providing information relating to this bug. – Richard Holloway Jul 29 '12 at 21:31

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