Reference Guide

Modern standby is a standby mode state that is different from S3 mode. In this state, the dynamic RAM is
maintained.
S4 is called suspend to disk state or hibernate mode, with no power. In this state, the dynamic RAM is not
maintained. If the system has been commanded to enter S4, the operating system writes the system context
to a non-volatile storage file and leave appropriate context markers. When the system comes back to the
working state, a restore file from the non-volatile storage can occur. The restore file must be valid. Dell
systems will be able to go to S4 if the operating system and the peripherals support S4 state. Windows 7/8
support S4 state.
S5 is the soft off state, with no power. The operating system does not save any context to wake up the
system. No data will remain in any component on the system board, that is cache or memory. The system
requires 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 9420/9420 2-in-1:
Model Number S0
Modern
standby
S4 S5
Dell Latitude
9420/9420 2-in-1
v
v
v
v
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