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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.
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 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 ...
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Advanced Configuration and Power Interface (ACPI) is an open standard that operating systems can use to discover and configure computer hardware components, to perform power management (e.g. putting unused hardware components to sleep), auto configuration (e.g. Plug and Play and hot swapping), and status monitoring.
Image credits: stupidsexyf1anders #4. Wouldn’t say it’s my “favorite” but it’s one that haunts me the most. When I was in college I went to a computer in the school library.
Try it yourself; hibernate Windows, then try to enter your BIOS setup when you turn it back on (usually by pressing the DEL key on startup). It won't work. Now try again; Hibernate windows, but this time, pull the power plug on your computer, remove the battery, and press and hold the power button for 30 seconds to empty the capacitors.
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