running through the circuitry and it can be worked on without damaging the
hardware or endangering the service personnel. The OS must be restarted to return to
the Working state. No hardware context is retained. Except for the real time clock,
power consumption is zero.
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, refer to ACPI specification section 7.5.2. For a
detailed definition of the transitions between each of the Sx states, refer to ACPI
specification 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.
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 saved in disk.
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.
System Power Plane
The system components are grouped as the following parties to let the system to
control the On/Off of power under different power management modes.
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