Chapter 14 configuring shutdown and power management options
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Chapter 14 - Configuring Shutdown and Power Management Options . Home Edition. Home Edition and Windows XP Professional have the same shutdown and power management options. How Does Your Computer Manage Power? . System enters low-power mode when inactive

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Home Edition Options

  • Home Edition and Windows XP Professional have the same shutdown and power management options


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How Does Your Computer Manage Power? Options

  • System enters low-power mode when inactive

  • System can be wakened by an application, modem, a network connection, or other devices.

    • If it’s a host, it can wake up when a client needs an Internet connection or a printer

    • A computer set up as a telephone answering device can wake when the phone rings


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How Does Your Computer Manage Power? Options

  • Security devices such as break-in detectors or cameras can wake the computer so it can send e-mail or pager alerts

  • Tasks in the Scheduled Tasks folder can be configured to wake the computer at the appointed time and perform the task


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Configuring Your Computer Options ’s BIOS

  • For Windows XP power management features to work properly, disable all power management features in your computer’s BIOS

    • Run its setup program

      • Usually accessed by pressing Del or F1 during the computer’s power-on self test; watch the screen for a message explaining how to enter setup

    • Browse the menus for all settings related to power management


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What Is OnNow? Options

  • OnNow is a Microsoft initiative to advance PC hardware so it supports instant-on capability, yet appears to be off when it’s not in use

    • Microsoft set the following design goals for a typical consumer PC running Windows XP:

      • Boot from power off to a usable state in 30 seconds

      • Resume from hibernation in 20 seconds

      • Resume from standby in 5 seconds


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Power Options Options

  • Right-click the desktop and choose Properties

  • In the Display Properties dialog box, click the Screen Saver tab and click Power

  • Or powercfg.cpl at a command prompt


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Power States: Standby vs. Hibernation Options

  • Standby

    • Shuts down hard drives, fans, the CPU, and other power-hungry components

    • Continues to draw some power for RAM

    • Loses data if power fails

  • Hibernation

    • Saves the contents of memory to the hard disk and then shuts off all power

    • Does not lose data if power fails


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Shutting Down Your Computer Options

  • On the Start menu, choose Turn Off Computer, Turn Off

    • On a domain, click Start, Shut Down, select Shut Down, and then click OK

  • Press the computer’s power button


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A hung application prevents shutdown Options

  • Press Ctrl+Alt+Del to display Task Manager

  • Open the Shut Down menu and hold down the Ctrl key as you click the Turn Off command. Poof!

  • On a domain, press Ctrl+Alt+Del and then hold down Ctrl when you click Shut Down


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Hibernating Options

Hibernating gives Maximum Power Savings


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Hiberfil.sys Options

  • During hibernation, the RAM data are stored in a file named hiberfil.sys on the root of your system drive

  • Hiberfil.sys is the size of your total RAM


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Turning on Hibernation Options

  • Press the power button that you’ve configured to hibernate (in Power Options)

  • On the Start menu, click Turn Off Computer

    • If the yellow button says Standby, hold down the Shift key


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Waking Up Your Computer Options

  • Press the power button

  • You can also configure various devices and applications to wake the computer

    • In Device Manager double-click the name of the device

    • In the device’s properties dialog box, click the Power Management tab

    • If there is no Power Management tab, you cannot use that device to wake the computer

  • There is a LOT more to it – see link Ch 14a


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Conserving Power on Portable Computers Options

  • When the computer's lid is closed, the display is switched off

  • When a portable computer is running on battery power, the display is dimmed

    • It automatically returns to full brightness when the computer is plugged in


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Conserving Power on Portable Computers Options

  • A portable computer can be configured so,

    • When it’s running on battery power, the processor runs at a lower speed

    • When it enters a low-battery condition, it automatically

      • Raises an alarm

      • Switches to a low-power state, or

      • Runs a program


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Protecting Your Data During a Power Outage Options

  • Use your program's autosave feature if it has one

  • Get in the habit of saving frequently

  • Establish-and follow-a regular backup routine


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UPS (Uninterruptible Power Supply) Options

  • Has a battery and provides enough power for 20 minutes or so

  • Permits an orderly shutdown of your computer

    • Link Ch 14c

    • Pic from http://spazioinwind.libero.it/zaccasoft/3hm220dp4all/vendo.htm


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ACPI v. APM Options

  • Windows provides three levels of power-management support: ACPI, APM and OS alone

  • Advanced Configuration and Power Interface (ACPI)

    • The operating system cuts power to monitor, disk drives, peripherals, and motherboard components when your computer is inactive


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ACPI vs. APM Options

  • Older Systems are not ACPI-compliant but use an Advanced Power Management (APM) 1.2 BIOS

    • A less versatile form of power management (see link Ch 14d)

  • On some earlier systems without even an APM 1.2 BIOS

    • OS can still conserve power by shuting down the monitor and disk drives during periods of inactivity


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ACPI v. APM Options

  • The advantage of ACPI over APM:

    • ACPI puts power management completely in the control of the operating system

    • That makes it reliable and consistent.

  • APM, on the other hand, is a BIOS specification

    • Different motherboards have different APM BIOSs

    • APM-enabled systems differ considerably in their power-management behavior


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Other advantages of ACPI Options

  • Control of USB and FireWire devices

  • Support for wake-on-LAN and wake-on-ring

  • User definition of the power and reset buttons

  • Better battery management

  • Dynamic configuration of PC cards (hot-swap)

  • Multiprocessor support

    • APM power management is not available on multiprocessor systems.


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Determining Whether Your System Is ACPI-Compliant Options

  • During setup, Windows XP decides whether your computer is ACPI-compliant

    • If it is, Setup installs an ACPI hardware abstraction layer (HAL)

    • Otherwise, Setup installs a standard APM (non-ACPI) HAL.


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Look in Device Manager Options

  • To see whether your computer is using ACPI for power management

    • Open the System Devices entry in Device Manager

    • Look for Microsoft ACPI-Compliant System


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