Suse or Mandrake? Nah, jut slackware for me! I just love it!
Anyway, to answer my own post: it looks that the drivers for acpi in kernel 2.4.22 aren't good enough to do the job on my Toshiba. So, same old thing, I had to download the patch from "acpi for linux" here: http://acpi.sourceforge.net/
patch the kernel and recompile it, et voilą! It works fine...