User`s guide

6.4 ACPI Suspend Modes and Resume Events

conga-TCA supports S3 (STR= Suspend to RAM). For more information about S3 wake events see section 9.4.5 “ACPI Submenu”.

S4 (Suspend to Disk) is not supported by the BIOS (S4_BIOS) but it is supported by the following operating systems (S4_OS= Hibernate):

• Windows 7, Windows Vista, Linux, Windows XP and Windows 2K

This table lists the “Wake Events” that resume the system from S3 unless otherwise stated in the “Conditions/Remarks” column:

Wake Event Conditions/Remarks

Power Button Wakes unconditionally from S3-S5.

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

SMBALERT# Wakes unconditionally from S3-S5.

PCI Express WAKE# Wakes unconditionally from S3-S5.

USB Mouse/Keyboard 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 (if setup node is available in BIOS setup program).

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. Only available in S5.

Watchdog Power Button Event Wakes unconditionally from S3-S5.