User`s guide

The following table lists the “Wake Events” that resume the system from both S1 or S3 unless otherwise stated in the “Conditions/Remarks”

column:

Wake Event Conditions/Remarks

Power Button Wakes unconditionally from S1-S5.

Onboard LAN Event Device driver must be congured for Wake On LAN support.

SMBALERT# Wakes unconditionally from S1-S5.

PCI Express WAKE# Wakes unconditionally from S1-S3.

PME# Activate the wake up capabilities of a PCI device using Windows Device Manager conguration options for this device OR set Resume On PME# to

Enabled in the Power setup menu.

USB Mouse/Keyboard

Event

When Standby mode is set to S1, no special action must be taken for a USB Mouse/Keyboard Event to be used as a Wake Event.

When Standby mode is set to S3, the following must be done for a USB Mouse/Keyboard Event to be used as a Wake Event..

USB Hardware must be powered by standby power source.

Set USB Device Wakeup from S3/S4 to ENABLED in the ACPI setup menu.

Under Windows XP add following registry entries:

Add this key:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\usb

Under this key add the following value:

“USBBIOSx“=DWORD:00000000

Note that Windows XP disables USB wakeup from S3, so this entry has to be added to re-enable it.

Congure USB keyboard/mouse to be able to wake up the system:

In Device Manager look for the keyboard/mouse devices. Go to the Power Management tab and check ‘Allow this device to bring the computer out of

standby’.

Note: When the standby state is set to S3 in the ACPI setup menu, the power management tab for USB keyboard /mouse devices only becomes

available after adding the above registry entry and rebooting to allow the registry changes to take affect.

RTC Alarm Activate and congure Resume On RTC Alarm in the Power setup menu.

Watchdog Power

Button Event

Wakes unconditionally from S1-S5.

Note

The above list has been veried using a Windows XP SP2 ACPI enabled installation.

When using Windows XP, Standby mode is either an S1 state or S3 state depending on what has been selected in the ACPI Conguration

Menu in the BIOS setup program. For more information about this see section 9.4.1 of this document.