All applications stop execution because all processors will be powered off. When this time-out occurs, the system immediately enters the ACPI Sleep (S3) state. There is a 5-second grace period between when the display turns off and when the screen off notification is fired. However, the system continues to run and all applications continue to operate normally as if the display was powered on. When this time-out occurs, the display immediately turns off. In Windows 10, the display is automatically dimmed 10 seconds before it is turned off. This time-out is no longer supported starting with Windows 8.1. This time-out is no longer supported starting with Windows 8.1. The following table summarizes the differences between a modern standby PC and a traditional sleep PC. Instead users would expect the system to stay turned on and connected but operate in a low-power mode. A modern standby PC is similar to a smartphone- few users would tolerate their smartphone periodically turning off and entering hibernation. That's because modern standby is a consistently low-power state with long battery life. Instead, Windows manages Hibernate intelligently, only using it when required to preserve user's battery life. Although Modern Standby systems support Hibernate (S4) state, it is not entered automatically after a fixed amount of time in sleep. Hibernate is used to reduce battery drain during sleep by saving all information in memory to the disk and powering off the system completely. Mobile systems also support the ACPI Hibernate (S4) state. If a user sets the two timeouts to be the same on a modern standby PC, the power model is similar to that used by most smartphones: when the screen is off, the system is always in a low-power mode and always connected to the Internet. The reason for providing two separate time-outs is to allow the system to stay turned on and fully running, but save power by turning off the display. Whatever you were working on when the PC entered hibernate mode returns to the screen.Traditional sleep (S3) and Modern Standby systems implement both a display idle time-out and a sleep idle time-out. However, when the computer awakens (by turning on the PC or lifting the laptop lid) it starts up faster than it ordinarily would, because its previous activities are retrieved from the hard disk. It conserves battery power for a laptop because the PC saves your work to the hard disk and shuts off. Hibernate is a deeper sleep for PCs that was designed mainly for laptops. (Sleep mode won't lose files this way, but it does use electricity.) And for Windows XP desktops, an interruption of power during standby mode causes unsaved files to be lost. But for laptops, the standby or sleep modes are a problem, because the PC's battery continues to run down even though the computer isn't doing anything. When you touch the keyboard, click on the mouse or open the laptop's lid, the PC awakens. Most Windows users are familiar with the idea of an idle computer "going to sleep." It's called "standby mode" in XP and "sleep mode" in Vista and Windows 7. Q What's your feeling about putting a Windows PC in hibernation?Ī There's some debate about whether it's a good idea to save time and electricity by using the "hibernate mode." Let me explain.
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