![]() When awakened, the system will typically return to S0 almost immediately-typically around two seconds. Memory still has power and maintains its content. At this level, the processor clocks are stopped to save power. When a computer enters Sleep mode, S1 is the first level of Sleep. Even so, certain devices that are not currently being used can enter into a low power state to save power. S0Īt S0 the computer is in a Working power state and the system is fully operational. We're mainly concerned about the Sleep states, but to keep everything in context, let's look at them all. All told, the ACPI spec lists six states, which are numbered S0 through S5. These levels, or more specifically, power states, are defined by the Advanced Configuration and Power Interface (ACPI) specification. The system actually goes through several levels of Sleep. However, the process is a bit more complex. When Windows enters sleep mode, it may appear that the system simply goes into a low power state and remains that way. I'll then show you how to use the PowerCfg command to investigate Windows Sleep states and the devices that support them on your Windows 10 system. In this article, I'll describe how Windows Sleep states work. ![]() ![]() ![]() These levels are actually called Windows Sleep states. Now, what I didn't tell you is that a Windows system goes into multiple levels of sleep as it drifts off into its power saving mode. ![]()
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