NCR VOYIX CX7 - G1 Sleeping; G0 Working; ACPI Sleep States (S0 - S5)

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G1 Sleeping
A computer state where the computer consumes a small amount of power, user mode
threads are not being executed, and the system appears to be off (from an end user's
perspective, the display is off, and so on). Latency for returning to the Working state
varies on the wake environment selected prior to entry of this state (for example, whether
the system should answer phone calls). Work can be resumed without rebooting the OS
because large elements of system context are saved by the hardware and the rest by
system software. It is not safe to disassemble the machine in this state.
G0 Working
A computer state where the system dispatches user mode (application) threads and they
execute. In this state, peripheral devices (peripherals) are having their power state
changed dynamically. The user can select, through some UI, various performance/power
characteristics of the system to have the software optimize for performance or battery life.
The system responds to external events in real time. It is not safe to disassemble the
machine in this state.
ACPI Sleep States (S0 - S5)
Under the G1 sleeping state ACPI defines levels of system sleep state support. The CX7
supports the following sleeping states:
l
S0: Normal Powered-On state
l
S1 (Standby): The S1 sleeping state is a low wake latency sleeping state. In this
state, no system context is lost (CPU or chip set) and hardware maintains all system
contexts.
Note
The CX7 does not support S1 state. Turning off the backlight and hard
drives provides the equivalent power savings (due to Intel's processor C-
states feature) at nearly zero latency.
l
S2: Not supported
l
S3 (Suspend to Ram): The S3 sleeping state is a low wake latency sleeping state.
This state is similar to the S1 sleeping state except that the CPU and system cache
context is lost (the OS is responsible for maintaining the caches and CPU context).
Control starts from the processor's reset vector after the wake event. In NCR
systems, during S3, power is only provided to the USB 3.0 ports.