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This is usually managed by the operating system's power management software or through the BIOS, thus different settings can be configured for laptop battery mode versus running from the battery charger. Low power mode is often achieved by reducing or even stopping the serial bus clock as well as possibly powering down the PHY device itself.
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.
The following example will set the machine to sleep after 10 minutes and sleep the display after five minutes, but only when powered by the battery. pmset -b sleep 10 displaysleep 5 The following command will assign slightly different power management settings for circumstances where the machine is powered by the charger.
Power gating is a commonly used circuit technique to remove leakage by turning off the supply voltage of unused circuits. Power gating incurs energy overhead; therefore, unused circuits need to remain idle long enough to compensate this overheads. A novel micro-architectural technique [10] for run-time power-gating caches of GPUs saves leakage ...
“It’s not just a nighttime problem,” adds sleep expert Alaina Tiani of the Cleveland Clinic Sleep Disorders Center. "It tends to infiltrate your daytime life, as far as the effects.”
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This mode is called "hybrid sleep" in Microsoft Windows other than Windows XP. A hybrid mode is supported by some portable Apple Macintosh computers, [ 2 ] compatible hardware running Windows Vista or newer, and Linux distributions running kernel 3.6 or newer.
Battery-powered equipment connected to mains electricity can be kept fully charged although switched on; for example, a mobile telephone can be ready to receive calls without depleting its battery charge. It enables devices to either turn on or off into a standby state automatically without human intervention (for example, a timer or Wake-on-LAN).