[XCodeR]

off - Turn ACPI completely off. Advanced Configuration and Power Interface (ACPI) is an open industry specification co-developed by Intel (TM), Microsoft (TM) and Toshiba (TM), that defines an operating system-directed power management and to make advanced configuration architectures. oldboot - Needed ACPI parts to boot remain active, others are turned off force - Force ACPI on

а также: http://www.lesswatts.org/projects/acpi/debug.php