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SubjectRe: [PATCH] battery: Fix charge_now returned by broken batteries
On Sat 2009-10-10 23:44:42, Miguel Ojeda wrote:
> On Sat, Oct 10, 2009 at 11:25 PM, Pavel Machek <pavel@ucw.cz> wrote:
> > Hi!
> >
> >> >> In "broken" batteries (is it broken finally? or is it expected
> >> >> behaviour?) like mine the old problem will be corrected, as it was
> >> >> only present in the charged state.
> >> >
> >> > I believe you better work around this in userspace... or agree that
> >> >>100% charge is possible.
> >>
> >> I agree that >100% charge is possible while charging (because that
> >> would mean the battery is over the last charged level); however, what
> >> does it mean when charged?
> >
> > Well, maybe the battery only updates full_charge_capacity during
> > powerdown or when the moon is full or something? (IOW you may be
> > breaking already working machines).
> >
>
> I do not know about batteries as I said, I was waiting for someone to
> point out how batteries (normally/should) work.

Different batteries work very differently, I'm afraid.

> > Or perhaps add quirk based on DMI or something?
>
> My battery is easily identified by its model name, so maybe we can
> apply the workaround only to known hardware. Still, that is a "heavy"
> solution, as I suppose there are many many battery models in the
> world. That is why I was asking whether some kind of standard/unified
> batteries' values/behavior exists (or implement it) that we can try to
> achieve easily with some heuristics like the one I proposed, instead
> of some kind of huge table-based workaround system.

The heuristics you proposed _will_ break other batteries, so it is not
acceptable without checking for model first.
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html


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