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Description 17
ACPI
The Advance Configuration and Power Interface (ACPI)–aware operating system can place the
system into a state where the hard drives spin-down, the system fans stop, and all processing is
halted. In this state the power supply is still on and the processors still dissipate some power, so the
power supply fan and processor fans are still running.
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NOTE
ACPI requires an operating system that supports this feature.
The Server Board SE7500CW2 supports sleep states S0, S4, and S5. When the server board is
operating in ACPI mode, the operating system retains control of the system and the operating
system policy determines the entry methods and wake-up sources for each sleep state. Sleep entry
and wake-up event capabilities are provided by the hardware but are enabled by the operating
system. Following is a summary of the supported sleep states:
• S0: Normal running state.
• S4: Hibernate or Save to Disk. The memory and machine state are saved to disk. Pressing the
power button or another wake-up event restores the system state from the disk and resumes
normal operation. This state assumes that no hardware changes were made to the system while
it was off.
• S5: Soft off. Only the RTC section of the chipset is running in this state.
CAUTION
The system is off only when the AC power is disconnected.
AC Link Mode
The AC link mode allows the system to monitor its AC input power so that if AC input power is
lost and then restored, the system returns to one of the following preselected settings:
• Last State (Factory Default Setting)
• Stay Off
The AC link mode settings can be changed by running the BIOS Setup Utility.
Wake on LAN
Wake on LAN allows system power to be activated by way of a network or modem. If the system
power is set to off, it can be turned on remotely by sending a specific packet from the main
computer to the remote system.