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Sleep mode (or suspend to RAM) is a low power mode for electronic devices such as computers, televisions, and remote controlled devices. These modes save significantly on electrical consumption compared to leaving a device fully on and, upon resume, allow the user to avoid having to reissue instructions or to wait for a machine to boot .
Sleep is the default power suspension state (instead of shut down) for desktop computers and mobile PCs such as laptops [75] [76] [81] and it replaces the standby feature of previous versions of Windows. [82] To ensure that the transition to sleep is reliable, Windows Vista does not allow sleep to be vetoed.
In Windows Vista, the Windows Display Driver Model (WDDM) does not support two different display adapters. When using two display adapters, both must use the same WDDM driver. Although Windows Vista still supports XPDM drivers, a WDDM driver is required for the Windows Aero user experience. [54] [55]
Sleep mode and hibernation can be combined: the contents of RAM are copied to the non-volatile storage and the computer enters sleep mode. This approach combines the benefits of sleep mode and hibernation: The machine can resume instantaneously, and its state, including open and unsaved files, survives a power outage.
Wake-on-LAN (WoL or WOL) [a] is an Ethernet or Token Ring computer networking standard that allows a computer to be turned on or awakened from sleep mode by a network message. The message is usually sent to the target computer by a program executed on a device connected to the same local area network (LAN).
Windows Vista also includes the ability to calibrate speakers to a given room's acoustics automatically using a software wizard. [7] Windows Vista also includes the ability for audio drivers to include custom DSP effects, which are presented to the user through user-mode System Effect Audio Processing Objects (sAPOs). [8]
Device Sleep with a maximum return latency of 20 milliseconds unless otherwise specified in Identify Data Log; These can be selected by the SATA AHCI driver, usually via a configuration option, or by the OS Power Options. Windows Vista and later allows the tweaking of AHCI LPM modes through a registry hack. [3] Hot swapping is disabled.
Windows Vista introduced WDDM 1.0 as a new display driver architecture designed to be better performing, more reliable, and support new technologies including HDCP. Hybrid Sleep, which combines hibernation and sleep mode functionality for enhanced stability in the event of power failure, also requires WDDM. [2] [why?]