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powercfg must be run from an elevated command prompt, and, under Windows XP, it requires workstation Administrator or power user rights. Power Schemes are configured on a per-user basis. The most common cause of problems with power saving and hibernation on Windows systems is an incompatible device driver.
Hibernation can be invoked from the Start menu or the command line. [10] Windows 95 supports hibernation through hardware manufacturer-supplied drivers and only if compatible hardware and BIOS are present. Since Windows 95 supports only Advanced Power Management (APM), hibernation is called Suspend-to-Disk. Windows 98 and later support ACPI.
The "It's now safe to power off the system" screen in Windows 10 and 11. Microsoft's Windows 98 was the first operating system to implement ACPI, [ 17 ] [ 18 ] but its implementation was somewhat buggy or incomplete, [ 19 ] [ 20 ] although some of the problems associated with it were caused by the first-generation ACPI hardware. [ 21 ]
The category Windows commands deals with articles related to internal and external commands supported by members of the Windows family of operating systems including Windows 95, Windows 98, Windows 98 SE and Windows ME as well as the NT family. Commands which are specific to DOS must be listed in Category:DOS commands (or its sub-categories ...
cmd.exe in Windows NT 2000, 4DOS, 4OS2, 4NT, and a number of third-party solutions allow direct entry of environment variables from the command prompt. From at least Windows 2000, the set command allows for the evaluation of strings into variables, thus providing inter alia a means of performing integer arithmetic. [26]
This approach combines the benefits of sleep mode and hibernation: The machine can resume instantaneously, but it can also be powered down completely (e.g. due to loss of power) without loss of data, because it is already effectively in a state of hibernation. This mode is called "hybrid sleep" in Microsoft Windows other than Windows XP.
On Windows CE .NET 4.2, [3] Windows CE 5.0 [4] and Windows Embedded CE 6.0 [5] it is referred to as the Command Processor Shell. Its implementations differ between operating systems, but the behavior and basic set of commands are consistent.
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]