
141
www.newnespress.com
Energy Optimized Software
ACPI moves power management decisions out of the BIOS and into the OS, allowing a
system to support po
wer management policies that are both more sophisticated and more
effective. Giving this responsibility to the OS is an approach designed for systems that
are typically “ on. ” It does not apply to something like a portable device, which requires
intelligent power conservation when the power switch is “ off. ” As discussed, such a
system requires a power policy that can respond to battery level, passage of time, and
other application-specifi c scenarios. An OS, by nature, has far too little ...