Dear Debiantist,
I am quite sure your Debian .config kernel file included the right modules, but you might want to check.
Can you send us the output for the following:
# lsmod | grep -i battery
and to check if there are kernel issues:
# dmesg | grep -i battery
the following might solve your problem
# modprobe ac
# modprobe battery
Read this:
http://www.linuxquestions.org/questi...are-12-632361/
it might help you.
Chris Abela