Date: Wed, 17 Mar 2010 08:36:03 -0400 From: "Alexandre \"Sunny\" Kovalenko" <gaijin.k@gmail.com> To: Joerg Wunsch <joerg_wunsch@uriah.heep.sax.de> Cc: freebsd-acpi@freebsd.org Subject: Re: Funny battery values (nx6325) Message-ID: <1268829363.6171.13.camel@RabbitsDen> In-Reply-To: <20100317074549.GC52442@uriah.heep.sax.de> References: <20100315062028.GC52442@uriah.heep.sax.de> <20100317070428.GA2924@server.vk2pj.dyndns.org> <20100317074549.GC52442@uriah.heep.sax.de>
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On Wed, 2010-03-17 at 08:45 +0100, Joerg Wunsch wrote:
> As Peter Jeremy wrote:
>
> > >Design capacity: 279 mAh
> > >Last full capacity: 279 mAh
>
> > Is this consistent or does it vary from boot to boot or if you
> > disconnect and reconnect the battery?
>
> Currently, my wife is on a business trip with that machine.
> Hopefully, I'll also get a statement about how long it lasts on
> battery once she is back ;-), and I'll re-check those values then.
>
> > >The battery is declared as 55 Wh, which would correspond to 5.1 Ah
> > >(probably 3 x 2 x 18650 cells).
> >
> > But is also over 3 years old. Almost everything you do to LiION
> > batteries makes their capacity drop.
>
> That's right, but it wouldn't be supposed to affect the "Design
> capacity", would it? ;)
>
> Can anybody tell where these values actually come from? I could
> perhaps even build a small microcontroller gadget, in order to query
> the battery for its values offline (using I²C aka SMbus) in order to
> see where the mistake might be.
>
You can dump your ASL (see Handbook for instructions) and search for
something like:
Method (_BIF, 0, NotSerialized)
{
If (\_SB.PCI0.SBRG.ECD.BTIN)
{
Noop
Return (BIFF)
}
Else
{
Acquire (ECMX, 0xFFFF)
// *** This is power unit (0 - mWh/mW, 1 - mAh/mA)
Store (\_SB.PCI0.SBRG.ECD.BIF0 (), Index (BIFF, 0x00))
// *** This is the design capacity in units above
Store (\_SB.PCI0.SBRG.ECD.BIF2 (), Index (BIFF, 0x01))
Store (\_SB.PCI0.SBRG.ECD.BIF2 (), Index (BIFF, 0x02))
Store (\_SB.PCI0.SBRG.ECD.BIF3 (), Index (BIFF, 0x03))
Store (\_SB.PCI0.SBRG.ECD.BIF4 (), Index (BIFF, 0x04))
Store (\_SB.PCI0.SBRG.ECD.BIF5 (), Index (BIFF, 0x05))
Store (\_SB.PCI0.SBRG.ECD.BIF6 (), Index (BIFF, 0x06))
Store (\_SB.PCI0.SBRG.ECD.BIF7 (), Index (BIFF, 0x07))
Store (\_SB.PCI0.SBRG.ECD.BIF8 (), Index (BIFF, 0x08))
Release (ECMX)
Return (BIFF)
}
}
and try to track down where the actual values came from. Chapter 10 of
the ACPI specification (http://www.acpi.info/spec.htm) should provide
you with more information on the subject.
The contents of the method above came from some ASL I had laying around
-- yours will likely be different. The important part is the returned
package that contains values in the specific sequence.
HTH,
--
Alexandre Kovalenko (Олександр Коваленко)
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