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PowerEdge T310 Technical Guide

Table 15 summarizes the power management features on this system.

Table 15. Power Management Features

Feature

Type

Enable/Status/

Ctrl bit location

Description

ACPI Mode Switch

Fixed

PCH

OS uses the SCI_EN bit in PCH to

switch from legacy mode to ACPI

mode

Sleep States

Fixed

PCH

Supported states:

S0 (Working)

S4 (Hibernation)

S5 (Soft-off)

Not supported:

S1 and S3 (standby)

Power Button

Fixed

PCH

In ACPI mode, OS has control of the

power button; in non-ACPI mode, SMI

handler owns power button events

Real-Time Clock

Fixed

PCH

OS can configure the system to wake

on the RTC alarm

Power Mgmt.

Timer

Fixed

PCH

24-bit power management timer

Power Mgmt. Event

(PME)

Generic

PCH

When a device signals PME, the system

wakes (if necessary), the OS detects

the event, and a Dell-defined ASL

routine handles the event;

wake-on-LAN is an example of a PME

USB Wake

Generic

N/A

Not supported since S1 is not

supported

DBS

N/A

Processor MSRs

Handles P state transition under

Windows

C State Support

N/A

Processor and PCH

registers

Allows multiple C-state support for

the processor; works under Windows

and an ACPI OS that understands C

states

Power Profile

Support

N/A

Processor and PCH

chipset registers

In addition to P, C, and T states, the

BIOS exposes the power profiles to the

OS; each power profile has specific

settings and will fine tune the

processor, MCH, and IOH

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