Acer Extensa 500 User Guide - Page 56
Power Management, Display Standby Mode
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Power Management Power Management This computer has a built-in power management unit that monitors system activity. System activity refers to any activity involving one or more of the following devices: keyboard, mouse, floppy drive, hard disk, peripherals connected to the serial and parallel ports, and video memory. If no activity is detected for a period of time (called an inactivity time-out), the computer stops some or all of these devices in order to conserve energy. Power management methods used by most computers are timer-based. You set inactivity time-out values for the display, hard disk, and other devices. The computer then "sleeps" when these time-outs elapse. The problem with this is that no two users are alike. Each of us has his or her own habits when using the computer, which makes timerbased power management ineffective. This computer manages its power according to the way you use your computer. This means the computer delivers maximum power when you need it, and saves power when you don't need the maximum - all without your intervention. There are no timers to set, because the power management system figures out everything for you. Note: We recommend you enable power management to prolong your battery life. Power Management Modes Display Standby Mode Screen activity is determined by the keyboard, the built-in touchpad, and an external PS/2 pointing device. If these devices are idle for the period determined by the computer's power management system, the display shuts off until you press a key or move the touchpad or external mouse. 36 User's Guide