[ubuntu] Faulty Power Managment in Jaunty

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http://ubuntuforums.org – Hey! I am still on good ol' Jaunty with my Zepto 3215 laptop. Recently I noticed, that power management fails to calculate remaining time on battery power correctly. Typically it will predict a remaining time which is between 50% or 70% longer than the actual time left. This also means, that ubuntu fails to hibernate even when battery symbol shows 0% battery left. To sum up: The battery % seems correct, but the remaining time is calculated wrongly and the power computer won't hibernate when power is critically low. This hasn't be a problem before. Any suggestions? (Hardware)