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PowerEdge R210 II Technical Guide
9.2 Supported ACPI States
● ACPI compliance: S0, S4, S5 supported
● No S1, S2, S3 (STR) support
● S4 supported by OS only
Table 11. Supported ACPI States
Events (Wake Up)
S0
System ON
S1
S2/S3
S4
Hibernate (OS
supported)
S5
Soft
Off
Power Button
—
—
RTC alarm
—
—
—
—
WOL
—
—
—
—
iDRAC
—
—
9.2.1 Power Management Modes
The R210 II uses operating system-based power management.
9.2.1.1 Power Saving BIOS Setting (OS Control)
Intel processors support Demand Based Switching (DBS) which enables the processor to dynamically
change its operating frequency in response to workload changes. The industry standard
implementation of this power management feature is in the Operating System (OS). The OS monitors
process and thread level utilization of the processor and uses processor controls to change the
processor‘s operating frequency. For heavy workloads, the OS runs the processor at higher
frequencies for additional performance. Lighter workloads do not need high performance, thus the
OS runs the processor at lower frequencies.
9.2.1.2 Maximum Performance
The Maximum Performance Mode disables power management. In this mode, the processor frequency
is statically set to the highest supported frequency.
The power management features are implemented through two categories: fixed or generic. Fixed
features use bits defined in the ACPI specification for specific capabilities. The fixed feature bits
give the OS complete control over the power management of a device since the location of the bits is
given to the OS in the FACP table. Thus, a driver can directly access bits to control a device‘s power
management. Generic features have defined enable and status bits, but the functionality is not fully
visible to the OS. Dell provides ASL code to handle the details of generic features, allowing the OS to
intelligently communicate with system-specific hardware.
Table 12 summarizes the power management features on this system: