Dell
35
PowerEdge R515 Technical Guide
Enable/Status/
Ctrl bit
location
In ACPI mode, OS has control of the power button. In non-
ACPI mode, SMI handler owns power button events.
The OS is able to configure the system to wake on the RTC
alarm.
24-bit power management timer is used.
Each host bus’s 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.
This feature is not supported on this system since the S1 state
is not supported.
This feature does P state transition under Microsoft
®
Windows
®
.
Processor and
PCH registers
This feature allows multiple C state supports for processor.
This feature will work under Windows and ACPI OS that
understand C states.
Processor/IMC
and PCH
chipset
registers
11G Servers are the most energy-smart servers that Dell
provides. In addition to P,C, and T states, BIOS exposes the
power profiles to the OS. Each power profile has specific
settings that fine tune processor, MCH, IOH, and Southbridge.
Table 13. BIOS Power Management Profiles
DBPM Disabled (BIOS sets P-State to MAX)
Memory frequency: Maximum Performance
Fan algorithm: Maximum Performance
Enable OS DBPM Control (BIOS exposes
all possible P states to OS)
Memory frequency: Maximum Performance
Fan algorithm: Minimum Power
Enable Dell System DBPM (BIOS does not make
all P states available to OS)
Memory frequency: Maximum Performance
Fan algorithm: Minimum Power
