Intel Vig390s manual System States and Power States, Wake-up Devices and Events

System States and Power States

Under ACPI, the operating system directs all system and device power state transitions. The operating system puts devices in and out of low-power states based on user preferences and knowledge of how devices are being used by applications. Devices that are not being used can be turned off. The operating system uses information from applications and user settings to put the system as a whole into a low-power state.

Table 10 lists the power states supported by the VIG390S motherboard along with the associated system power targets. See the ACPI specification for a complete description of the various system and power states.

Table 10: Power States and Targeted System Power

Global States	Sleeping States		Processor	Device States	Targeted System
			States		Power
G0 – working	S0	– working	C0 – working	D0 – working state	Full Power > 30W
state
G1 – sleeping	S1	– Processor	C1 – stop grant	D1, D2, D3 – device	5W < power <
state	stopped			specification specific	52.5W
G1 – sleeping	S3	– Suspend to	No power	D3 – no power except	Power < 5W
state	RAM.			for wake-up logic
G1 – Sleeping	S4	– Suspended	No power	D3 – no power except	Power < 5W
state	to disk.			for wake-up logic
G2/S5	S5	– Soft off.	No power	D3 – no power except	Power < 5W
	saved			for wake-up logic
G3 –	No power to the		No power	D3 – no power for	No power to the
Mechanical off	system			wake-up logic, except	system. Service
AC power is				when provided by	can be performed
disconnected				battery or external	safely.
for the				source
computer

Wake-up Devices and Events

Table 11 lists the devices or specific events that can wake the computer from specific states.

Table 11: Wake-up Devices and Events

These devices/events can wake up the computer…	…from this state
LAN	S1, S3, S4, S5
Modem (Back panel Serial Port A)	S1, S3
PME# signal	S1, S3, S4, S5
Power switch	S1, S3, S4, S5
PS/2 devices	S1, S3
RTC alarm	S1, S3, S4, S5
USB	S1, S3

Note: The use of these wake-up events from an ACPI state requires an operating system that provides full ACPI support. In addition, software, drivers, and peripherals must fully support ACPI wake events.

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