White Papers

May 2021
In addition, to clarify memory volatility and data retention in situations where the system is put in different ACPI power states the following is
provided (those ACPI power states are S0, S1, S3, S4 and S5):
S0 state is the working state where the dynamic RAM is maintained and is read/write by the processor.
S1 state is a low wake-up latency sleeping state. In this state, no system context is lost (CPU or chip set) and hardware maintains all
system contexts.
S3 is called “suspend to RAM” state or stand-by mode. In this state the dynamic RAM is maintained. Dell systems will be able to go to
S3 if the OS and the peripherals used in the system supports S3 state. Linux and Windows7 support S3 state.
S4 is called “suspend to disk” state or “hibernate” mode. There is no power. In this state, the dynamic RAM is not maintained. If the
system has been commanded to enter S4, the OS will write the system context to a non-volatile storage file and leave appropriate
context markers. When the system is coming back to the working state, a restore file from the non-volatile storage can occur. The
restore file has to be valid. Dell systems will be able to go to S4 if the OS and the peripherals support S4 state. Windows 7 support S4
state.
S5 is the “soft” off state. There is no power. The OS does not save any context to wake up the system. No data will remain in any
component on the system board, i.e. cache or memory. The system will require a complete boot when awakened. Since S5 is the shut
off state, coming out of S5 requires power on which clears all registers.
MS is “Modern Standby”, a low-power version of S0 with screen off and various other components being in a low power
state. Dynamic RAM is maintained, and MS supports a rapid return to full S0 state.
The following table shows all the states supported by Dell Latitude 7220 Rugged Extreme Tablet:
Model Number S0 S1 S3 S4 S5 MS
Dell Latitude 7220 Rugged Extreme Tablet X X X X
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