Less consumption than in S0 and greater than in the other sleep states. ![]() System power state S1 is a sleeping state with the following characteristics: Also see ADMINISTRATOR_POWER_POLICY structure. To restrict the system to a subset of Sx states, a user can provide MaxSleep and MinSleep fields in SYSTEM_POWER_POLICY structure. Typically, when the user presses the sleep button, the system goes to the S3 system power state. A user can specify the action to take when the sleep power button is pressed by using the Sleep button action. Use powercfg /a to enumerate all available sleep states on a system. Furthermore, some devices might be able to wake the system only from S1 and not from deeper sleep states. For example, on some machines certain chips on the motherboard might lose power at S3, while on others such chips retain power until S4. All ACPI-compliant computers shut off their processor clocks at S1 and lose system hardware context at S4 (unless a hibernate file is written before shutdown), as listed in the sections below.ĭetails of the intermediate sleep states can vary depending on how the manufacturer has designed the machine. With each successive sleep state, from S1 to S4, more of the computer is shut down. In addition, on some computers, an external indicator tells the user that the system is merely sleeping. ![]() Some devices can wake the system from a sleeping state when certain events occur. The operating system need not be rebooted to return the computer to the working state. ![]() Unlike a system in the shutdown state (S5), however, a sleeping system retains memory state, either in RAM or on disk, as specified for each power state below in System hardware context sections. A system in one of these states is not performing any computational tasks and appears to be off. States S1, S2, S3, and S4 are the sleeping states.
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