Intel IM-Q35 Series manual 3-11, BIOS Setup Suspend mode, USB Device Wakeup from S3/S4

The S1 sleep mode is a low power state. In this state, no system context is lost (CPU or chipset) and hard- ware maintains all system context.

The S3 sleep mode is a lower power state where the information of system configuration and open appli- cations/files is saved to main memory that remains powered while most other hardware components turn off to save energy. The information stored in memory will be used to restore the system when a “wake up” event occurs.

BIOS Setup

Suspend mode

This item specifies the power saving modes for ACPI function. If your operating system supports ACPI, you can choose to enter the Standby mode in S1 (POS) or S3 (STR) fashion through the setting of this field. Options are:

[S1 (POS)]

[S3 (STR)]

USB Device Wakeup from S3/S4

This setting allows the activity of the USB device to wake up the system from S3/S4 sleep state.

ACPI Version Features

This setting allows you to select the ACPI version.

APM Configuration

Resume On PME#

When setting to [Enabled], this setting allows your system to be awakened from the power saving modes through any event on PME (Power Management Event).

Resume On RTC Alarm

When [Enabled], your can set the date and time at which the RTC (real-time clock) alarm awakens the system from suspend mode.

Restore On AC Power Loss

This item specifies whether your system will reboot after a power failure or interrupt occurs. Settings are:

[Power Off]	Always leaves the computer in the power off state.
[Power On]	Always leaves the computer in the power on state.
[Last State]	Restores the system to the status before power failure
	or interrupt occurred.

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