Wrong remaining capacity of my battery when it is charged

Wrong remaining capacity of my battery when it is charged

[Nicolas]

Hello,
I have a problem with the remaining capacity indicator of my battery. 
Here is what I read in /proc/acpi/battery/BAT0/info:
design capacity:         79920 mWh
last full capacity:      75000 mWh
I run Linux 2.6.15.
But when the battery is charged, remaining capacity as indicated in 
/proc/acpi/battery/BAT0/state is 79920 mWh. When the battery is 
charging, remaining capacity slowly rises to 75000 mWh, then jumps to 
79920 mWh.
I could not figure out if remaining capacity is computed by the battery 
itself, which would mean that there is a little bug in my battery 
firmware, or by ACPI, using other informations.
Thanks in advance for explanations!
Nicolas

Re: Wrong remaining capacity of my battery when it is charged

[Alexey Starikovskiy]

Nicolas wrote:
> Hello,
> I have a problem with the remaining capacity indicator of my battery.
> Here is what I read in /proc/acpi/battery/BAT0/info:
> design capacity:         79920 mWh
> last full capacity:      75000 mWh
> I run Linux 2.6.15.
> But when the battery is charged, remaining capacity as indicated in
> /proc/acpi/battery/BAT0/state is 79920 mWh. When the battery is
> charging, remaining capacity slowly rises to 75000 mWh, then jumps to
> 79920 mWh.
> I could not figure out if remaining capacity is computed by the battery
> itself, which would mean that there is a little bug in my battery
> firmware, or by ACPI, using other informations.
> Thanks in advance for explanations!
> Nicolas
ACPI does not compute anything. Information is supplied by BIOS methods (_BST in DSDT).
_BST could compute something, but it usually just reads registers of embedded controller (battery).


Regards,
Alex.
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