Battery change in sleep mode breaks battery support

[Lorenzo Colitti <lorenzo-Z4WAQ3j+MphBDgjK7y7TUQ@public.gmane.org>]

Hi,

I am having problems with battery monitoring and sleep mode: if I plug 
in or unplug the battery while the machine is asleep, when it wakes up 
the change has not been registered and no further changes are logged.

This means that I suspend the machine while on AC power and wake it up 
on battery power, there is no way for me to keep track of how much 
charge is left, which is a problem!

As an example, I started with init=/bin/sh, with no battery and AC 
plugged in, and did the following:

> sh-3.00# modprobe battery
> ACPI: Battery Slot [C138] (battery absent)
> ACPI: Battery Slot [C137] (battery absent)
> sh-3.00# modprobe ac
> ACPI: AC Adapter [C135] (on-line)
> sh-3.00# echo 3 > /proc/acpi/sleep

While the machine was asleep, I plugged in the battery and removed AC 
power, then turned the machine on. The kernel didn't notice that the 
battery had been plugged in:

> sh-3.00# cat /proc/acpi/battery/C138/info 
> present:                 no
> sh-3.00# cat /proc/acpi/battery/C137/info
> present:                 no
> sh-3.00# cat /proc/acpi/ac_adapter/C135/state 
> state:                   off-line

Unplugging and reinserting the battery and/or reloading the battery 
module didn't help. :(

The machine is an HP NC6000 on which ACPI mostly works (decompiling and 
recompiling the DSDT yields only the warning "Unknown reserved name 
(_WDG)"). I have ACPI debugging enabled in the kernel, but I don't know 
how to use it.

Any ideas?


Thanks!
Lorenzo


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