Wake-On-Lan (Wol); Advanced Configuration And Power Interface (Acpi); Acpi Power Control; Table 28. Acpi Power States - Intel X38ML - Server Board Motherboard Technical Manual

Platform Management
Power always on – Power server on when AC is restored.
Restore power state – Restore power state to the state it was in when AC was lost.
When standby power returns after an AC power loss, the BMC activates the server power as
directed by the configuration.
5.2.8

Wake-On-LAN (WOL)

The BMC does not directly participate in WOL. The NICs directly interact with the chipset to
initiate the power on of the system. The BMC blocks power-on until it is ready for the power-on
to occur. See Section 5.2.5.3. The BMC must detect when the system is trying to power on and
assert the POWER_ON_ENABLE signal for a WOL-initiated DC power-on to occur.
5.3

Advanced Configuration and Power Interface (ACPI)

The BMC works with the ACPI BIOS and with the server board hardware. The ACPI power
states are outlined in the following table.
State Supported
S0 Yes Working
S1 Yes Sleeping. Hardware context maintained; equates to processor and chipset clocks stopped.
The BMC detects that the system has exited the ACPI S1 sleep state when it is notified by
the BIOS SMI handler.
S2 No Not supported
S3 No Not supported
S4 No Not supported
S5 Yes Soft off.
5.3.1

ACPI Power Control

The chipset implements ACPI-compatible power control. Power control requests are routed to
the power push-button input of the chipset, allowing the ACPI-compatible power push-button
logic in the chipset to be used.
58

Table 28. ACPI Power States

The front panel power LED is on (not controlled by the BMC).
The fans spin at the normal speed, as determined by sensor inputs.
Front panel buttons work normally.
The front panel power LED blinks at a rate of 1 Hz with a 50% duty cycle (not controlled
by the BMC).
The watchdog timer is stopped.
The power and reset buttons are unprotected.
The front panel buttons are not locked.
The fans are stopped.
The power up process goes through the normal boot procedure.
The power and reset buttons are unlocked.
Intel order number E15331-006
Intel® Server Board X38ML
Description
Revision 1.3