Hi, I'm a newbie of Debian; I use Debian 6 with a macbook pro and I would like to improve the durability of the battery. So I installed powertop (1.11) but a message says: no ACPI power usage estimate available. How can solve this?? >From synaptic I see I have installed only the following package: acpi; acpi-support-base; acpid. Which other packages should I install?? Best Riccardo