XO power management

[Ismael Schinca]

Thanks, for starters this is really useful, because it's not at all similar
to what I've been observed. The computer powers off with battery levels
between 10-15% and the led starts blinking around 5-10%. I'm using several
batteries on the same XO 1.0 computer. Granted, the batteries are not fresh
ones, but that's exactly what I am trying to figure out. How the battery
behaviour changes when battery capacity starts to decrease over time.
Any additional information will be most welcome.

Ismael

2011/3/24 Paul Fox <pgf at laptop.org>

> ismael wrote:
>  > Hello everyone, I'm trying to perform some tests on XO battery life
>  > performance and I have some questions which I couldn't find a clear
> answer
>  > in the wiki or this list:
>
> i'm sure richard will chime in, but here's a start.
>
>  >
>  > - When the battery level is "critically low" the OS (Sugar 0.88 based
>  > Dextrose) performs a safe shutdown. I would like to know what is the
> exact
>  > condition that triggers this.
>
> the answer to this depends on what version of powerd is running.  in
> the latest powerd versions, we force a shutdown if the capacity is 1%
> (or less :-), or if the battery voltage is 5.7V or less.  we don't
> bother with these checks unless the capacity is below 40% (which may
> be a pointless optimization).  these checks were slightly different
> in powerd versions 27 and earlier, but i suspect dextrose is running
> something newer than that.
>
>  > - Likewise, at some level controlled by the XO EC, the battery led light
>  > begins to flash orange/red. I would also like to know which is the exact
>  > condition that triggers this. Is it the SOC, battery voltage, ACR... ?
> And
>
> i believe this value is 5.7V.  (i.e., battery voltage)
>
>  > what level triggers this condition? I would also like to know the level
> in
>  > which the XO performs a "hard" poweroff.
>
> 5.5V on XO-1.5, 5.4V on XO-1.
>
> also remember that the voltage at the battery will change, substantially,
> between the suspended and running states -- so what the EC sees during
> suspend may be several tenths of a volt higher during suspend than when
> the system is running.
>
> paul
>
>  >
>  > Any help is appreciated.
>  >
>  > Thanks!
>  >
>  > Regards,
>  > Ismael
>  >
>  > --
>  > Ismael Schinca
>  > Centro Ceibal - Depto. Técnico - I+D
>  > Avda. Italia 6201 - Edificio Los Ceibos
>  > Montevideo - Uruguay.
>  > Tel.: 2601 57 73 Int. 2232
>  > part 2     text/plain                 129
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>
> =---------------------
>  paul fox, pgf at laptop.org
>



-- 
Ismael Schinca
Centro Ceibal - Depto. Técnico - I+D
Avda. Italia 6201 - Edificio Los Ceibos
Montevideo - Uruguay.
Tel.: 2601 57 73 Int. 2232
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