[lubuntu] PowerBook powermanagement does not work

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http://ubuntuforums.org – Hi, I am using a PowerBook G4 1,67 15" with Lubuntu 13.04: All updates are done regular with SoftwareUpdater. After disconnecting the power supply the PowerBook does not recognize it is working in battery mode. Searching the forum does not deliver a solution. Any ideas? Best wishes from Germany, Heliophon (Hardware)