Specifications

Dell
PowerEdge T310 Technical Guide
33
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