Here's something that might help: I switched to another power supply; same 
brand, smaller, but still.
The power management seems to be working as it should now (fine) but also the 
errors have gone from my logs (bug 549741).

To me this definitively points to a bug somewhere in the bios, the battery's 
firmware and/or the power supply (if any).
It may very well even be limited to a specific series of devices.

If that is the case, I don't think there will be a proper fix for it. Maybe 
addition of a quirk to detect it and activate a workaround (what?).
Of course I'll be happy to do more testing and report the outcome here. Just 
let me know.

cheers
Tom

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devicekit-power incorrectly reports battery fully charged when connecting AC
https://bugs.launchpad.net/bugs/418428
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