![]() In S1-S3 states, volatile memory is kept refreshed to maintain the system state. Applications need to be prepared for this and take the appropriate action when the system returns to the working state. In the case of a critical transition, such as when the critical battery threshold is reached, the system doesn't notify applications and drivers. For more information about how the system determines when to enter sleep, see System sleep criteria.īefore the system enters sleep, it determines the appropriate sleep state, notifies applications and drivers of the pending transition, and then transitions the system to the sleep state. By default, the system uses the lowest-powered sleep state supported by all enabled wake-up devices. The system enters sleep based on a number of criteria, including user or application activity and preferences that the user sets on the Power & sleep page of the Settings app. Enabling legacy S3 WoL is not necessary and may cause DHCP and/or DNS packet storms on your network. ![]() Waking a computer with a magic packet is natively supported by Modern Standby. To conserve energy, especially on battery powered devices, it's recommended that you power down hardware components when they're not being used.ĭo not enable S3 wake-on-LAN (WoL) on Modern Standaby capable systems. Whether the screen is on or off, the device is in a full running state. Working state: S0ĭuring the working state, the system is awake and running. The SYSTEM_POWER_STATE enumeration defines the values that are used to specify system power states. The system returns to the working state only after a full reboot. The system is completely off and consumes no power. This state is comprised of a full shutdown and boot cycle. This allows for a smaller hibernation file, more appropriate for systems with less storage capabilities. The working context can be restored if it's stored on nonvolatile media.įast startup is where the user is logged off before the hibernation file is created. Some components remain powered so the computer can wake from input from the keyboard, LAN, or a USB device. The system saves the contents of volatile memory to a hibernation file to preserve system state. Power consumption is reduced to the lowest level. Note: SoC systems that support Modern Standby don't 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. In states S1-S3, volatile memory is kept refreshed to maintain the system state. Systems typically support one of these three states, not all three. S3 consumes less power than S2, and S2 consumes less power than S1. ![]() The amount of power consumed in states S1-S3 is less than S0 and more than S4. 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 in response to hardware and network events. Some SoC systems support a low-power idle state known as Modern Standby. ![]() Hardware components that aren't 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 the kernel, drivers, and services are preserved and restored, not re-started, on user-initiated sleeps and shutdowns. System integrators and developers who create drivers or applications with a system service should be particularly careful of driver quality issues, such as memory leaks. ![]()
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