kpowersave stuck at battery charging
arvidjaar at mail.ru
Wed Jan 2 05:10:40 PST 2008
On Wednesday 02 January 2008, Alexey Starikovskiy wrote:
> Andrey Borzenkov wrote:
> > This is did not happen before; I am not sure right now what caused this
> > battery aging or some software change) nor whether this is
> > issue.
> > kpowersave is stuck at assuming battery is loading and at 94%. Sysfs
> > battery state as Full:
> Frequent battery charging shortens lifetime of the battery, so some (may
> be all now)
> notebook manufacturers do not start charging battery until it discharge
> to some degree (~90%).
I thought Li-Ion batteries do not have memory effect. Actually I remember to
have read recommendation to avoid deep discharges of Li-Ion battery, it was
adviced to charge it as often as possible.
> It could be your case. Please try to discharge battery to, say, 89% and
> then check if it charges to the
That is exactly the question - how do you compute 100%? As far as I can tell the
only possibility is - when battery stops charging. At this point you have to
assume battery is fully charged.
I tried to discharge battery (it was around 78%) and plug AC in again. It went
on Charging until the same limit after that state changed to Full (well, in case
of ACPI battery we really only can state - not (dis-)charging, there is no
special Full state flag); kpowersave still believes battery is not fully
charged. Main interface shows 84% (no Charging) - tooltip states it is being
This would indicate that my battery lost 6% of capacity in new year, but
question still remains - how should user tools properly calculate charge level?
> > - does ACPI battery code misuse POWER_SUPPLY_PROP_ENERGY_FULL?
> > - does HAL misuse .../energy_full?
> > - does kpowersave misuse battery.charge_level.last_full?
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