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1.11.2.1
Power Input
When resuming from an AC power failure, the computer may return to the power state it was
in before power was interrupted (on or off). The computer’s response can be set using the Last
Power State feature in the BIOS Setup program’s Boot menu.
1.11.2.2
Instantly Available PC Technology
Instantly Available PC technology enables the board to enter the ACPI S3 (Suspend-to-RAM)
sleep-state. While in the S3 sleep-state, the computer will appear to be off (the power supply
is off, and the front panel LED is amber if dual colored, or off if single colored.) When signaled
by a wake-up device or event, the system quickly returns to its last known wake state. Table 7
lists the devices and events that can wake the computer from the S3 state.
The use of Instantly Available PC technology requires operating system support and drivers
for any installed PCI Express add-in card.
1.11.2.3
LAN Wake Capabilities
LAN wake capabilities enable remote wake-up of the computer through a network. The LAN
subsystem monitors network traffic at the Media Independent Interface. Upon detecting a
Magic Packet* frame, the LAN subsystem asserts a wake-up signal that powers up the
computer.
1.11.2.4
Wake from USB
USB bus activity wakes the computer from an ACPI S3, S4, and S5 states.
NOTE
Wake from USB requires the use of a USB peripheral that supports Wake from USB.
1.11.2.5
WAKE# Signal Wake-up Support
When the WAKE# signal on the PCI Express bus is asserted, the computer wakes from an ACPI
S3, S4, or S5 state.
1.11.2.6
Wake from S5
When the RTC Date and Time is set in the BIOS, the computer will automatically wake from an
ACPI S5 state.
1.11.2.7
Wake from Consumer IR
CIR activity wakes the computer from an ACPI S3, S4, or S5 state.
1.11.2.8
+5 V Standby Power Indicator LED
The standby power indicator LED shows that power is still present even when the computer
appears to be off. Figure 7 shows the location of the standby power LED.
