Acpi Features - Supermicro X7DWA-N User Manual

low on virtual memory and there is insuffi cient hard drive space for saving the
data, you can be alerted of the potential problem. You can also confi gure Supero
Doctor to provide you with warnings when the system temperature goes beyond
a pre-defi ned range.
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ACPI Features

ACPI stands for Advanced Confi guration and Power Interface. The ACPI specifi -
cation defi nes a fl exible and abstract hardware interface that provides a standard
to integrate power management features throughout a PC system, including its
hardware, operating system and application software. This enables the system
to automatically turn on and off peripherals such as CD-ROMs, network cards,
hard disk drives and printers. This also includes consumer devices connected to
the PC such as VCRs, TVs, telephones and stereos.
In addition to enabling operating system-directed power management, ACPI pro-
vides a generic system event mechanism for Plug and Play and an operating- sys-
tem-independent interface for confi guration control. ACPI leverages the Plug and
Play BIOS data structures while providing a processor architecture-independent
implementation that is compatible with Windows 2000, Windows XP, Windows
2003, Windows 2003 Servers and Windows Vista.
Slow Blinking LED for Suspend-State Indicator
When the CPU goes into a suspend state, the chassis power LED will start blinking
to indicate that the CPU is in suspend mode. When the CPU is in the S1 mode,
the Power LED blinks every second. When in the S3 mode, the Power LED will
blink every 5-second. When the user presses any key, the CPU will wake-up and
the LED will automatically stop blinking and remain on.
Main Switch Override Mechanism
When an ATX power supply is used, the power button can function as a system
suspend button to make the system enter SoftOff state. The monitor will be sus-
pended and the hard drive will spin down. Pressing the power button again will
cause the whole system to wake-up. During the SoftOff state, the ATX power
supply provides power to keep the required circuitry in the system alive. In case
the system malfunctions and you want to turn off the power, just press and hold
power button for 4 seconds. This option can be set in the Advanced Setup section
of the BIOS Setup routine.
External Modem Ring-On
Wake-up events can be triggered by a device such as the external modem ringing
when the system is in the SoftOff state. Note that external modem ring-on can
only be used with an ATX 2.01 (or above) compliant power supply.
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Chapter 1: Introduction