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 (i.e. > > battery aging or some software change) nor whether this is kernel/HAL/kpowersave > > issue. > > > > kpowersave is stuck at assuming battery is loading and at 94%. Sysfs displays > > 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 > 100%. 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 charged. POWER_SUPPLY_NAME=BAT1 POWER_SUPPLY_TYPE=Battery POWER_SUPPLY_STATUS=Full POWER_SUPPLY_PRESENT=1 POWER_SUPPLY_TECHNOLOGY=Li-ion POWER_SUPPLY_VOLTAGE_MIN_DESIGN=10800000 POWER_SUPPLY_VOLTAGE_NOW=11340000 POWER_SUPPLY_CURRENT_NOW=0 POWER_SUPPLY_ENERGY_FULL_DESIGN=38880000 POWER_SUPPLY_ENERGY_FULL=37530000 POWER_SUPPLY_ENERGY_NOW=35640000 POWER_SUPPLY_MODEL_NAME=XM2038P04 POWER_SUPPLY_MANUFACTURER= 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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