Chapter 14 - Configuring Chapter 14 - Configuring Shutdown and Power Shutdown and Power Management Options Management Options

Home EditionHome Edition

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

How Does Your Computer How Does Your Computer Manage Power? Manage Power?

System enters low-power mode when System enters low-power mode when inactiveinactive

System can be wakened by an System can be wakened by an application, modem, a network application, modem, a network connection, or other devices. connection, or other devices. – If it’s a host, it can wake up when a client If it’s a host, it can wake up when a client

needs an Internet connection or a printer needs an Internet connection or a printer – A computer set up as a telephone A computer set up as a telephone

answering device can wake when the answering device can wake when the phone ringsphone rings

How Does Your Computer How Does Your Computer Manage Power? Manage Power?

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

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

Configuring Your Configuring Your Computer’s BIOS Computer’s BIOS

For Windows XP power management For Windows XP power management features to work properly, disable all features to work properly, disable all power management features in your power management features in your computer’s BIOScomputer’s BIOS– Run its setup programRun its setup program

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

– Browse the menus for all settings Browse the menus for all settings related to power managementrelated to power management

What Is OnNow? What Is OnNow?

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

goals for a typical consumer PC goals for a typical consumer PC running Windows XP: running Windows XP:

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

Resume from hibernation in 20 seconds Resume from hibernation in 20 seconds

Resume from standby in 5 seconds Resume from standby in 5 seconds

Power Options Power Options

Right-click the Right-click the desktop and desktop and choose choose PropertiesPropertiesIn the Display In the Display Properties dialog Properties dialog box, click the box, click the Screen Saver tab Screen Saver tab and click Powerand click PowerOr Or powercfg.cpl powercfg.cpl at a command at a command promptprompt

Power States: Standby vs. Power States: Standby vs. Hibernation Hibernation

StandbyStandby– Shuts down hard drives, fans, the CPU, Shuts down hard drives, fans, the CPU,

and other power-hungry componentsand other power-hungry components– Continues to draw some power for RAMContinues to draw some power for RAM– Loses data if power failsLoses data if power fails

HibernationHibernation– Saves the contents of memory to the hard Saves the contents of memory to the hard

disk and then shuts off all power disk and then shuts off all power – Does not lose data if power failsDoes not lose data if power fails

Shutting Down Your Shutting Down Your Computer Computer

On the Start menu, choose Turn On the Start menu, choose Turn Off Computer, Turn OffOff Computer, Turn Off– On a domain, click Start, Shut Down, On a domain, click Start, Shut Down,

select Shut Down, and then click OK select Shut Down, and then click OK

Press the computer’s power Press the computer’s power buttonbutton

A hung application prevents A hung application prevents shutdown shutdown

Press Ctrl+Alt+Del to display Press Ctrl+Alt+Del to display Task ManagerTask Manager

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

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

HibernatingHibernating

Hibernating gives Maximum Hibernating gives Maximum Power SavingsPower Savings

Hiberfil.sysHiberfil.sys

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

Hiberfil.sys is the size Hiberfil.sys is the size of your total RAMof your total RAM

Turning on HibernationTurning on Hibernation

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

– On the Start menu, click Turn Off On the Start menu, click Turn Off ComputerComputer

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

Waking Up Your Computer Waking Up Your Computer

Press the power buttonPress the power button

You can also configure various devices You can also configure various devices and applications to wake the computerand applications to wake the computer– In Device Manager double-click the name of the In Device Manager double-click the name of the

device device – In the device’s properties dialog box, click the In the device’s properties dialog box, click the

Power Management tab Power Management tab – If there is no Power Management tab, you cannot If there is no Power Management tab, you cannot

use that device to wake the computeruse that device to wake the computer

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

Conserving Power on Conserving Power on Portable Computers Portable Computers

When the computer's lid is When the computer's lid is closed, the display is switched closed, the display is switched offoff

When a portable computer is When a portable computer is running on battery power, the running on battery power, the display is dimmeddisplay is dimmed– It automatically returns to full It automatically returns to full

brightness when the computer is brightness when the computer is plugged inplugged in

Conserving Power on Conserving Power on Portable Computers Portable Computers

A portable computer can be A portable computer can be configured so, configured so, – When it’s running on battery power, When it’s running on battery power,

the processor runs at a lower speedthe processor runs at a lower speed– When it enters a low-battery When it enters a low-battery

condition, it automaticallycondition, it automatically

Raises an alarmRaises an alarmSwitches to a low-power state, Switches to a low-power state, ororRuns a programRuns a program

Protecting Your Data During Protecting Your Data During a Power Outage a Power Outage

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

Get in the habit of saving Get in the habit of saving frequentlyfrequently

Establish-and follow-a regular Establish-and follow-a regular backup routinebackup routine

UPS (Uninterruptible Power UPS (Uninterruptible Power Supply)Supply)

Has a battery and Has a battery and provides enough provides enough power for 20 power for 20 minutes or sominutes or soPermits an orderly Permits an orderly shutdown of your shutdown of your computercomputer– Link Ch 14cLink Ch 14c– Pic from Pic from

http://spazioinwind.libero.it/zaccahttp://spazioinwind.libero.it/zaccasoft/3hm220dp4all/vendo.htmsoft/3hm220dp4all/vendo.htm

ACPI v. APMACPI v. APM

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

Advanced Configuration and Advanced Configuration and Power Interface (ACPI)Power Interface (ACPI)– The operating system cuts power to The operating system cuts power to

monitor, disk drives, peripherals, and monitor, disk drives, peripherals, and motherboard components when your motherboard components when your computer is inactivecomputer is inactive

ACPI vs. APM ACPI vs. APM

Older Systems are not ACPI-Older Systems are not ACPI-compliant but use an Advanced compliant but use an Advanced Power Management (APM) 1.2 Power Management (APM) 1.2 BIOSBIOS– A less versatile form of power management A less versatile form of power management

(see link Ch 14d)(see link Ch 14d)

On some earlier systems without On some earlier systems without even an APM 1.2 BIOSeven an APM 1.2 BIOS– OS can still conserve power by shuting down the OS can still conserve power by shuting down the

monitor and disk drives during periods of inactivitymonitor and disk drives during periods of inactivity

ACPI v. APMACPI v. APM

The advantage of ACPI over APM:The advantage of ACPI over APM:– ACPI puts power management ACPI puts power management

completely in the control of the completely in the control of the operating systemoperating system

– That makes it reliable and consistent.That makes it reliable and consistent.

APM, on the other hand, is a BIOS APM, on the other hand, is a BIOS specificationspecification– Different motherboards have different APM BIOSsDifferent motherboards have different APM BIOSs– APM-enabled systems differ considerably in their APM-enabled systems differ considerably in their

power-management behaviorpower-management behavior

Other advantages of ACPIOther advantages of ACPI

Control of USB and FireWire devicesControl of USB and FireWire devices

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

User definition of the power and reset User definition of the power and reset buttons buttons

Better battery managementBetter battery management

Dynamic configuration of PC cards (hot-Dynamic configuration of PC cards (hot-swap) swap)

Multiprocessor supportMultiprocessor support– APM power management is not available on APM power management is not available on

multiprocessor systems. multiprocessor systems.

Determining Whether Your Determining Whether Your System Is ACPI-Compliant System Is ACPI-Compliant During setup, Windows XP During setup, Windows XP decides whether your computer decides whether your computer is ACPI-compliantis ACPI-compliant– If it is, Setup installs an ACPI If it is, Setup installs an ACPI

hardware abstraction layer (HAL)hardware abstraction layer (HAL)– Otherwise, Setup installs a Otherwise, Setup installs a

standard APM (non-ACPI) HAL. standard APM (non-ACPI) HAL.

Look in Device ManagerLook in Device Manager

To see whether To see whether your computer is your computer is using ACPI for using ACPI for power power managementmanagement– Open the System Open the System

Devices entry in Devices entry in Device ManagerDevice Manager

– Look for Microsoft Look for Microsoft ACPI-Compliant ACPI-Compliant System System