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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.
Active-state power management (ASPM) is a power management mechanism for PCI Express devices to garner power savings while otherwise in a fully active state. Predominantly, this is achieved through active-state link power management; i.e., the PCI Express serial link is powered down when there is no traffic across it.
This means that due to hardware issues the computer may be wakeable from its soft off state (S5) but doesn't wake from sleep or hibernation or vice versa. Starting with Windows Vista, the operating system logs all wake sources in the System event log. The Event Viewer and the powercfg.exe /lastwake command can retrieve them. [15]
Windows Vista introduced a hybrid sleep feature, which saves the contents of memory to hard disk but instead of powering down, enters sleep mode. If the power is lost, the computer can resume as if hibernated. Windows 7 introduced compression to the hibernation file and set the default size to 75% of the total physical memory. [18]
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.
By default, Windows 7 automatically sets the size of the hibernation file to 75% of a computer's total physical memory. The operating system also compresses the contents of memory during the hibernate process to minimize the possibility that the contents exceeds the default size of the hibernation file. [54]
Control Panel has been part of Microsoft Windows since Windows 1.0, [1] with each successive version introducing new applets. Beginning with Windows 95, the Control Panel is implemented as a special folder, i.e. the folder does not physically exist, but only contains shortcuts to various applets such as Add or Remove Programs and Internet Options.
Task Scheduler 1.0 is included with Windows NT 4.0 [7] (with Internet Explorer 4.0 or later), Windows 2000, [7] Windows XP [8] and Windows Server 2003. [9] It runs as a Windows Service, and the task definitions and schedules are stored in binary.job files.