A computer system's BIOS (basic input/output system) POST (power-on self test) sets a bit or bits in an ISA (industry standard architecture) I/O (input/output) port, in a memory, or in a scratch pad register accessed via an ISA I/O port (indexed or non-indexed), that an AML (ACPI control method machine...http://www.google.es/patents/US6499102?utm_source=gb-gplus-sharePatente US6499102 - Method of dynamically changing the lowest sleeping state in ACPI
Method of dynamically changing the lowest sleeping state in ACPI