Power consumption is reduced to the lowest level. SoC systems that support modern standby (the low-power idle state) do not use S1-S3. The hibernation file saves the system state in case the system loses power while in sleep. Hybrid sleep, used on desktops, is where a system uses a hibernation file with S1-S3. Some components remain powered so the computer can wake from input from the keyboard, LAN, or a USB device. In these states (S1-S3), volatile memory is kept refreshed to maintain the system state. Systems typically support one of these three states, not all three. Power consumed in these states (S1-S3) is less than S0 and more than S4 S3 consumes less power than S2, and S2 consumes less power than S1. Systems that support Modern Standby do not use S1-S3. In this state, the system can very quickly switch from a low-power state to high-power state, so that it can respond quickly to hardware and network events. Some SoC systems support a low-power idle state known as Modern Standby. Hardware components that are not in use can save power by entering a lower power state.
The following table lists the ACPI power states from highest to lowest power consumption. While driver quality has always been important, the up time between kernel reboots may be significantly longer than on previous versions of the OS because on user initiated sleeps and shutdowns, the kernel, drivers, and services will be preserved and restored, not re-started.
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System integrators and developers creating drivers or applications with a system service should be particularly careful of driver quality issues, such as memory leaks.
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