[ltp] I need an "ACPI for Dummies" reference

[C Sink]

Hi all. I know ACPI gets discussed a lot and apologies if I'm being
repetative but I'm very much in need of a "gentle introduction" to
ACPI and APM. I've got Gentoo (kernel 2.4.26) running on my T30 but
would really like to get suspend/hibernate and power throttling
working.  I've tried installing the ibm-acpi package but get errors on
compilation: "no rule to make target 'modules'".

I'm at a loss of what to do now. 

TIA for any and all help. 

Pengwin