Deep Sleep state is a low-power state supported by many modern x86
microprocessors. In this state the core maintains its context, its
internal clock and the clock of L2 cache are stopped. While in this
mode, the CPU may not respond to interrupts and other signals. This
state is always entered from Sleep
state. In some CPU families, like Pentium III and Pentium 4, Deep
Sleep state is the lowest power-saving state. In other, more modern
families, the CPU may transition from this state to Deeper Sleep
mode which has even lower power consumption.
Deep Sleep state provides better power savings than Sleep state,
but transition time from this state to normal operation mode is even
slower than for the Sleep state.
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