Administrator Guide

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, CMS, S4 and S5):

S0 state is the working state where the dynamic RAM is maintained and is read/write by the processor.

CMS (Modern standby-connected) is a standby mode state that is different from S3 mode. In this state, the

dynamic RAM is maintained. Dell systems will be able to go to CMS if the OS and the peripherals used in the

system supports CMS state. Win 10 support CMS state. When in the lowest power state, systems may look

very similar to systems in the S3 state—processors are powered off, memory is in self-refresh.

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. Win 10 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.

The following table shows all the states supported by Dell Latitude™ 7400:

Model Number

CMS

Dell Latitude™ 7400

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