Hello *nixer,
I have some problems with ACPI recently.
I am not able to identify when the adapter of my laptop was connected or not, even the light of the computer that shows if the adapter is connected did not lit.
I tried some debugging:

Quote:acpi_listen

out:

battery PNP0C0A:00 00000081 00000001
battery PNP0C0A:00 00000080 00000001

in:

battery PNP0C0A:00 00000081 00000001
battery PNP0C0A:00 00000080 00000001


sudo tail -f /var/log/messages.log

Aug 16 15:15:48 venam raptor: ACPI action undefined: PNP0C0A:00

I can't see whether it is plugged in or not.
I also tried to add the action but in vain.
Somehow I saw something weird, the light of the battery was on.
I changed the command to `acpi - b` to see if the battery was recognize and it was!
I don't really know if this is a problem from my computer itself but now it works.
EDIT: It never worked after that.