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PowerEdge R510 Technical Guide 48
Table 15. Summary of Power Management Features
Feature
Type
Enable/Status/ Ctrl
bit location
Description
ACPI Mode
Switch
Fixed
ICH-10
The OS uses the SCI_EN bit in ICH to switch from legacy mode to
ACPI mode.
Sleep States
Fixed
ICH-10
Supported states: S0 (Working), S4-OS (Hibernation in Windows
OS), and S5 (Soft-off).
S1 (also called standby or suspend) and S3 are not supported.
Power Button
Fixed
ICH-10
In ACPI mode, OS has control of the power button. In non-ACPI
mode, SMI handler owns power button events.
Real-Time
Clock
Fixed
ICH-10
The OS is able to configure the system to wake on the RTC
alarm.
Power Mgmt.
Timer
Fixed
ICH-10
ICH-10 24-bit power management timer is used.
Power Mgmt.
Event (PME)
Generic
ICH-10
Each host bus’ PME# signal is routed to a separate general-
purpose event pin in the chipset. 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
one example of a PME.
USB wake
Generic
N/A
This feature is not supported on this system since the S1 state is
not supported.
OS DBS
N/A
Processor MSRs
This feature does P state transition under Windows
C State Support
Fixed and
Generic
Processor MSR and
ICH-10 registers
This feature allows multiple C state support for Processor. This
feature works under Windows and any ACPI OS that understand
C states.
Power Profile
support
N/A
Processor/MCH and
ICH-10 chipset
registers.
11G Servers are the most energy-smart servers that Dell ships.
In addition to P, C, and T states, BIOS exposes the Power
Profiles to the OS. Each Power Profile has specific settings and
fine tunes the processor (MCH, IOH and South Bridge).
Current Power Profiles that 11G BIOS exposes in BIOS setup are detailed in the following table. The Active
Power Controller mode is the default mode.