Thanks mellon2003!
I tried what you said and the acpi appears to work, only there are other problems:
1) how do i enter any of the suspension modes without being root? is it even possible? because let's face it, the root mode in mandrake is horrible...
2) i still can't make the battery last for the normal 2,5 hours. how do i solve that?
3) i seem to have problems accessing the cdrom and floppy drives! i don't even find a way to mount them! how do i this?
Thanks in advance!