Acpi - NEC EXPRESS5800/120Rc-2 Service Manual

The BMC performs the following:
Monitors server board temperature and voltage
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Monitors processor presence and controls Fault Resilient Boot (FRB)
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Detects and indicates baseboard fan failure
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Manages the SEL interface
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Manages the SDR Repository interface
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Monitors the SDR/SEL timestamp clock
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Monitors the system management watchdog timer
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Monitors the periodic SMI timer
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Monitors the event receiver
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Controls secure mode, including video blanking, diskette write-protect
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monitoring, and front panel lock/unlock initiation
Controls Wake On LAN via Magic Packet support.
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ACPI

The Advanced 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. However, in this state the power supply is still on and the
processors are still dissipating some power such that the power supply fan and
processor fans are still running.
Note: ACPI requires an operating system that supports its
feature.
Only when the AC power is disconnected is the system completely
off.
Your server's system BIOS supports sleep states s0, s1, s4, and s5.
The sleep states are defined as follows:
s0: Normal running state.
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s1: Processor sleep state.
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No context will be lost in this state and the processor caches will maintain
coherency.
s4: Hibernate or Save to Disk.
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The memory and machine state are saved to disk. Pressing the power button or
other wakeup event restores the system state from the disk and resumes normal
operation. This assumes that no hardware changes have been made to the system
while it was off.
1-12 System Overview
! CAUTION