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73416ba
(Get the code!)
Here's something that might help: I switched to another power supply; same brand, smaller but still.
The errors have gone from my logs (fine) but also the power management seems to be working as it should (bug 418428).
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