XO power management
ischinca at plan.ceibal.edu.uy
Thu Mar 24 08:55:24 EDT 2011
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.
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
> > 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
> > 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... ?
> i believe this value is 5.7V. (i.e., battery voltage)
> > what level triggers this condition? I would also like to know the level
> > 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.
> > 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
> > _______________________________________________
> > Devel mailing list
> > Devel at lists.laptop.org
> > http://lists.laptop.org/listinfo/devel
> paul fox, pgf at laptop.org
Centro Ceibal - Depto. Técnico - I+D
Avda. Italia 6201 - Edificio Los Ceibos
Montevideo - Uruguay.
Tel.: 2601 57 73 Int. 2232
-------------- next part --------------
An HTML attachment was scrubbed...
More information about the Devel