I've imported the latest version of the ACPI-CA from Intel.  This, plus some 
bug fixes from me and Christos, should make ACPI work much more reliably on 
many systems.

Even if you were already successfully running ACPI, please retest with the new 
version and confirm whether or not it works.

I can personally vouch that it works on a Dell Inspiron 8500 laptop, correctly 
reporting battery and thermal data.  :-)