American Megatrends StorTrends 1312 User Manual page 21

System States and Power States
Under ACPI, the operating system directs all system and device power state transitions.
The operating system puts devices in and out of low-power states based on user
preferences and knowledge of how devices are being used by applications. Devices that
are not being used can be turned off. The operating system uses information from
applications and user settings to put the system as a whole into a low-power state.
The StorTrends 1312 supports the following power states:
Global States Sleeping States
G0 – working state S0 – working
G1 – sleeping state S1 – CPU stopped
G1 – sleeping state S3 – Suspend-to-
RAM. Context
saved to RAM.
G2 – mechanical No power to the
off. AC power is system.
disconnected from
the computer.
* Total system power is dependent on the system configuration, including add-in boards and peripherals
powered by the system chassis' power supply.
** Dependent on the standby power consumption of wake up devices used in the system.
Wake Up Devices and Events
The following table lists the devices or specific events that can wake the computer from
specific states.
These devices/events can wake up
the computer...
Plug and Play
In addition to power management, ACPI provides controls and information so that the
operating system can facilitate Plug and Play device enumeration and configuration.
ACPI is used only to enumerate and configure devices that do not have other hardware
standards for enumeration and configuration. PCI devices on a desktop board, for
example, are not enumerated by ACPI.
CPU States
C0 – working
C1 – stop grant
no power
no power
Power Switch
RTC alarm
LAN
PCI bus PME#
Device States Targeting System
Power*
D0 – working state Full power > 30 W
D1, D2, D3 – 5 W < power < 30 W
device
specification
specific
D3 – no power Power < 5W**
except for wake up
logic
D3 – no power for No power to the
wake up logic, system so that service
except when can be performed.
provided by
battery or external
source.
... from this state
S1, S3, S5
S1, S3
S1, S3
S3
Chapter 1 Hardware Features 15