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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.
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]
Sleep mode has gone by various names, including Stand By, Suspend and Suspend to RAM. Machine state is held in RAM and, when placed in sleep mode, the computer cuts power to unneeded subsystems and places the RAM into a minimum power state, just sufficient to retain its data. Because of the large power saving, most laptops automatically enter ...
Hibernation is a means of avoiding the burden of saving unsaved data before shutting down and restoring all running programs and re-opening documents and browser tabs. Both hibernation and sleep preserve memory fragmentation and atrophy that lead to mobile devices working poorer the longer they run without a full reboot.
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.
An uninterruptible sleep state is a sleep state that will not handle a signal right away. It will wake only as a result of a waited-upon resource becoming available or after a time-out occurs during that wait (if specified when put to sleep). It is mostly used by device drivers waiting for disk or network IO (input/output).
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]
The Windows System Assessment Tool (WinSAT) is a module of Microsoft Windows Vista, Windows 7, Windows 8, Windows 8.1, Windows 10, and Windows 11 that is available in the Control Panel under Performance Information and Tools (except in Windows 8.1, Windows 10, and Windows 11).