It is a hardware problem. To reset acpi of the mac :
* Shut down your Ubuntu
* Disconnect the AC Adapter
* Remove the computer's battery
* Press the power button for 5 seconds
* Reconnect the battery and the AC Adapter
* Turn your computer on
** Changed in: linux-source-2.6.22 (Ubuntu)
Status: Triaged => Invalid
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[GUTSY] ACPI: battery state reporting errors since 2.6.22-9
https://bugs.launchpad.net/bugs/129388
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