Sleeping State

[Dona*]

from www.acpi.info

Sleeping State Definitions
Sleeping states (Sx states) are types of sleeping states within the global sleeping state, G1. The Sx states are briefly defined below. For a detailed definition of the system behavior within each Sx state, see section 7.5.2. For a detailed definition of the transitions between each of the Sx states, see section 9.1.
S1 Sleeping State:
The S1 sleeping state is a low wake-up latency sleeping state. In this state, no system context is lost (CPU or chip set) and hardware maintains all system context.
S2 Sleeping State
The S2 sleeping state is a low wake-up latency sleeping state. This state is similar to the S1 sleeping state except the CPU and system cache context is lost (the OS is responsible for maintaining the caches and CPU context). Control starts from the processor’s reset vector after the wake-up event.
S3 Sleeping State:
The S3 sleeping state is a low wake-up latency sleeping state where all system context is lost except system memory. CPU, cache, and chip set context are lost in this state. Hardware maintains memory context and restores some CPU and L2 configuration context. Control starts from the processor’s reset vector after the wake-up event.
S4 Sleeping State:
The S4 sleeping state is the lowest power, longest wake-up latency sleeping state supported by ACPI. In order to reduce power to a minimum, it is assumed that the hardware platform has powered off all devices. Platform context is maintained.
S5 Soft Off State:
The S5 state is similar to the S4 state except the OS does not save any context nor enable any devices to wake the system. The system is in the “soft” off state and requires a complete boot when awakened. Software uses a different state value to distinguish between the S5 state and the S4 state to allow for initial boot operations within the BIOS to distinguish whether or not the boot is going to wake from a saved memory image.

DOMANDA: Come posso gestire il passaggio tra il normale stato di elaborazione (G0) a quelli Sleep e viceversa? ci sw o doc appositi che mi possono aiutare?
grazie