How to enable apm in kernel 2.6?

[Eugen Dedu <Eugen.Dedu@pu-pm.univ-fcomte.fr>]

Hi,

I use kernel-image-2.6.7-powerpc, 2.6.7-5, on an alu 15" G4 powerbook. 
  I need the battery level, but the /proc/apm pseudo-file does not 
exist.  How can I enable it?

In apmd package description I find that:
"Debian kernels are built with APM support but it is disabled by
 default.  You need to boot the kernel with the "apm=on" option if you
 want to enable the driver."
However, after doing that, the /proc/apm still does not exist.

Thank you,
Eugen