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On Thu, 02 Nov 2006, Richard B. Johnson wrote: > No known laptop bothers to do this. That's why the batteries fail at the > most inoportune times and why it will decide to shut down when it feels > like it, based totally upon some detected voltage drop when a disk-drive > started. Weird, I though the whole point behind a SBS hardware stack requiring something fairly intelligent in the battery pack and allowing for (runtime switchable!) Ah or Wh modes of operation was to allow vendors to do exactly that: measure (V,A) permanently while the cells are above the safety cut-off fuse level, and accumulate it... Well, IBM embedded a microcontroller of some sort on every SBS ThinkPad battery pack, and the ThinkPad reports battery data in Wh, so I expected it to actually do the hard work to know how much energy is still left in the pack... especially given how much $$$ they want for the packs :-) I have no idea of what software is really running inside the battery pack, of course, so maybe the SBS battery EC just sits there doing something else instead of taking real-time measurements of the battery charge (that wouldn't surprise me too much...). -- "One disk to rule them all, One disk to find them. One disk to bring them all and in the darkness grind them. In the Land of Redmond where the shadows lie." -- The Silicon Valley Tarot Henrique Holschuh - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
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