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52
Power Management
The BIOS supports the Advanced Configuration and Power Management
Interface (ACPI) 3.0 specification. A key feature of ACPI is that the operating
system, not the BIOS, configures and implements power management. The CX3
terminal supports the Global system power states defined by ACPI.
Computer States
G3 Mechanical Off
A computer state that is entered and left by mechanical means.
Example
Turning off the system's power through the movement of a large red
switch.
Various government agencies and countries require this operating mode. It is
implied by the entry of this off state through mechanical means that no electrical
current is running through the circuitry and that it can be worked on without
damaging the hardware or endangering service personnel. The OS must be
restarted to return to the Working state. No hardware context is retained. Except
for the real-time clock, power consumption is zero.
Note
Current leakage is 2.5uA at G3.
G2/S5 Soft Off
A computer state where the computer consumes a minimal amount of power.
No user mode or system mode code is run. This state requires a large latency in
order to return to the Working state. The system's context will not be preserved
by the hardware. The system must be restarted to return to the Working state. It
is not safe to disassemble the machine in this state.
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