Lenovo ThinkStation S20, Hardware Manual

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Power management
Power management reduces the power consumption of certain components of the
computer such as the system power supply, processor, hard disk drives, and some
monitors.
Automatic configuration and power interface (ACPI) BIOS
Being an ACPI BIOS system, the operating system is allowed to control the power
management features of the computer and the setting for Advanced Power
Management (APM) BIOS mode is ignored. Not all operating systems support
ACPI BIOS mode.
Automatic Power-On features
The Automatic Power-On features within the Power Management menu allow you
to enable and disable features that turn on the computer automatically.
v
Serial Port A Ring Detect : With this feature set to Enabled and an external
modem connected to serial port (COM1), the computer will turn on
automatically when a ring is detected on the modem.
v PCI Modem Ring Detect : With this feature set to Enabled , the computer will
turn on automatically when a ring is detected on the internal modem.
v
PCI Wake Up: This feature allows PCI cards that support this capability to wake
the system.
v Wake Up on Alarm
: You can specify a date and time at which the computer will
be turned on automatically. This can be either a single event or a daily event.
v
Wake on LAN : If the computer has a properly configured token-ring or Ethernet
LAN adapter card that is Wake on LAN-enabled and there is remote network
management software, you can use the Wake on LAN feature. When you set
Wake on LAN to
Enabled , the computer will turn on when it receives a specific
signal from another computer on the local area network (LAN).
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Hardware Maintenance Manual