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This multifunction keyboard has separate keys for sleep, wake and power on/off. On PC keyboards, power keys were often based on rubber mechanisms, like this Yahoo-branded example. Early Windows PCs generally lacked the ability to control power through software, and power keys were not physically possible. The increasing use of USB connections ...
IEC 60417-5008, [7] the power-off symbol (circle) on a button or toggle, indicates that using the control will disconnect power to the device. (0 or means off.) (0 or means off.) IEC 60417-5009, [ 8 ] the standby symbol (line partially within a broken circle), indicates a sleep mode or low power state.
Sleep on macOS consists of the traditional sleep, Safe Sleep, and Power Nap. In System Preferences , Safe Sleep [ 8 ] is referred to as sleep. Since Safe Sleep also allowed state to be restored in an event of a power outage , unlike other operating systems, hibernate was never offered as an option.
Advanced Configuration and Power Interface (ACPI) is an open standard that operating systems can use to discover and configure computer hardware components, to perform power management (e.g. putting unused hardware components to sleep), auto configuration (e.g. Plug and Play and hot swapping), and status monitoring. It was first released in ...
On the other hand, a system in sleep mode still consumes power to keep the data in the RAM, and thus cannot last indefinitely, as hibernation can. Detaching power from a system in sleep mode results in data loss, while cutting the power of a system in hibernation has no risk; the hibernated system can resume when and if the power is restored.
A sleep timer is a function on many modern televisions and other electronic devices that shuts off the power after a preset amount of time. The setting is usually made either from the remote control of the device or the device's menu. They are intended to allow viewers to watch as they fall asleep.
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powercfg (executable name powercfg.exe) is a command-line utility that is used from an elevated Windows Command Prompt to control all configurable power system settings, including hardware-specific configurations that are not configurable through the Control Panel, on a per-user basis.