Intel® Server Board SE7520JR2

System BIOS

4.9.2.6Sleep to On (ACPI)

If an operating system is loaded, the sleep button generates a wake event to the ACPI chipset and a request (via SCI) to the OS to place the system in the “On” state. The OS retains control of the system and OS policy determines what sleep state (if any) and sleep sources the system can wake from.

4.9.2.7System Sleep States

The platform supports the following ACPI System Sleep States:

ACPI S0 (working) state

ACPI S1 (sleep) state

ACPI S4 (suspend to disk) state

ACPI S5 (soft-off) state

The platform supports the following wake up sources in an ACPI environment. As noted above, the OS controls the enabling and disabling of these wake sources.

Devices that are connected to all USB ports, such as USB mice and keyboards can wake the system up from the S1 sleep state.

PS/2 keyboards and mice can wake up the system from the S1 sleep state.

Both serial ports can be configured to wake up the system from the S1 sleep state.

PCI cards, such as LAN cards, can wake up the system from the S1 or S4 sleep state. Note that the PCI card must have the necessary hardware for this to work.

As required by the ACPI Specification, the power button can always wake up the system from the S1 or S4 state.

2.

Additionally, if an ACPI operating system is loaded, the following can cause the system to wake up: the PME, RTC, or Wake-On-LAN.

Table 44: Supported Wake Events

 

Wake Event

Supported via ACPI (by sleep state)

Supported

 

 

 

 

Via Legacy

 

 

 

 

Wake

 

 

Power Button

Always wakes system.

Always

 

 

 

 

wakes

 

 

 

 

system

 

 

 

 

 

 

 

Ring indicate from Serial A

Wakes from S1 and S4.

Yes

 

 

 

 

 

 

 

Ring indicate from Serial B

Wakes from S1 and S4. If Serial-B (COM2) is used for

Yes

 

 

 

Emergency Management Port, Serial-B wakeup is

 

 

 

 

 

 

disabled.

 

 

 

 

 

PME from PCI cards

Wakes from S1 and S4.

Yes

 

 

 

 

 

 

 

RTC Alarm

Wakes from S1. Always wakes the system up from S4.

No

 

 

Mouse

Wakes from S1.

No

 

 

 

 

 

 

 

Keyboard

Wakes from S1.

No

 

 

 

 

 

 

 

USB

Wakes from S1.

No

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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