FIC a440 Servicehandbuch
Software Functional Overview
FIC A440 Series Service Manual
3-25
G2/S5 - Soft Off
This is a state where the computer consumes a minimal amount of power. No user mode or
system mode code is running. This state requires a large latency in order to return to the
Working state. The system’s context will not be preserved by the hardware. The system must
be restarted to return to the Working state. It is not safe to disassemble the machine.
G3 – Mechanical Off:
This state is entered and left by a mechanical means. It is implied by the entry of this off state
through a mechanical means that the no electrical current is 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.
This is a state where the computer consumes a minimal amount of power. No user mode or
system mode code is running. This state requires a large latency in order to return to the
Working state. The system’s context will not be preserved by the hardware. The system must
be restarted to return to the Working state. It is not safe to disassemble the machine.
G3 – Mechanical Off:
This state is entered and left by a mechanical means. It is implied by the entry of this off state
through a mechanical means that the no electrical current is 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.
3.5.4 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 and transition, refer to the ACPI specification.
S1 Sleeping State (Doze mode)
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 contexts.
S2 Sleeping State (Standby mode)
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 (STR mode)
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 (STD mode)
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 “SOFF” 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. This is 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.
The Sx states are briefly defined below. For a detailed definition of the system behavior
within each Sx state and transition, refer to the ACPI specification.
S1 Sleeping State (Doze mode)
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 contexts.
S2 Sleeping State (Standby mode)
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 (STR mode)
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 (STD mode)
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 “SOFF” 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. This is 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.