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Warning You're responsible for saving your work to disk before initiating Standby mode. If your battery dies while your computer is on Standby, and you haven't saved your data files, you could lose some work. If you see an exam question that asks about a course of action that will prevent data loss, think 'hibernate' rather than 'standby.'
On any given PC, some power management features may require activation in the BIOS setup program. The procedure for changing BIOS settings varies, but you usually have to press a function key, or combination of keys, during power-up. The startup text sequence usually clues you in on the details.
Lab 9-1 presents the steps for modifying an existing scheme and saving it under a new name.
Lab 9-1: Changing a Power Management Scheme
1. Open the Power Management control panel by choosing Start?Control Panel?Power Options.
2. Choose the scheme Always On by using the drop-down list box on the Power Schemes tab.
Note also the aptly named Presentation scheme, which differs from Always On by never turning off the display when the PC is running on AC power. The PC will not enter standby or hibernation mode when using the Presentation scheme.
3. Change the setting for Turn Off Hard Disks to read After 4 Hours.
4. Click the Save As button and provide a name for the new power scheme.
If you simply click OK instead of Save As, Windows XP saves the revised settings with the same scheme name.
Windows XP Professional recognizes two different power management standards: APM (Advanced Power Management) and ACPI (Advanced Configuration and Power Interface). The next two sections explore the differences.
Advanced Power Management, or APM, is a pseudo-standard common on pre-1999 machines but getting less common every day. I say 'pseudo-standard' because APM doesn't nail down a lot of details, leaving the computer manufacturer to interpret some of its guidelines. That's one of the reasons APM isn't completely satisfactory; another is that APM doesn't let the operating system do much in the way of controlling power usage, leaving that task to the BIOS. To be able to use it, APM must be supported by a given computer's hardware and BIOS for Windows XP Professional.
Tip You can tell whether Windows XP thinks your PC fully supports APM by choosing the Power Options control panel and looking for the APM tab. If it's there, you can make sure APM is enabled by checking the box labeled Enable Advanced Power Management Support. (Windows automatically checks the box and enables APM support if the APM BIOS is known to be compatible, but a given BIOS might be compatible and Windows doesn't know it - hence the opportunity for you to check the box manually.) If the APM tab isn't there, Windows XP doesn't perceive your PC as APM-capable, and you shouldn't try to use APM.
Instant Answer If your APM machine isn't powering down at shutdown, and it used to do so with a previous version of Windows, go to the APM tab of the Power Options control panel, enable APM, and restart.
Instant Answer Three quick facts you may need:
* Windows XP Professional supports APM version 1.2.
* You have to be logged on as an Administrator in order to turn APM on or off.
* You can use the support tool APMSTAT.EXE (installable by running SETUP in the installation CD's \SUPPORT\TOOLS folder) to see whether Windows XP supports the version of APM that your computer uses. (If your PC uses ACPI, which I describe in the next section, then APMSTAT tells you that your inquiry about APM isn't "relevent." Guess somebody turned off his spel chekker.)
Advanced Configuration and Power Interface (ACPI) is a newer and more rigorous standard than APM, and the designers of Windows XP Professional wrote the operating system with ACPI in mind. ACPI makes power management (and, incidentally, Plug and Play) work better.
As with APM, the PC must support ACPI in the hardware and the BIOS for Windows XP to use this standard. You can tell whether Windows XP thinks your PC fully supports ACPI by choosing Start?Control Panel?System?Hardware, clicking the Device Manager tab, and expanding the Computer icon. If the computer's label says:
* Advanced Configuration and Power Interface (ACPI) PC
* ACPI Uniprocessor PC
* ACPI Multiprocessor PC
you have ACPI support. If it says
* Standard PC
* MPS Uniprocessor PC
* MPS Multiprocessor PC
Warning If your BIOS setup program lets you switch between these two power management standards, don't try doing so after Windows XP is already installed (unless you want to reinstall the operating system!). Windows XP installs a Hardware Abstraction Layer, or HAL, based on what power management standard Windows 'sees' in the BIOS at installation time. You can't change the HAL to support a different power management standard without reinstalling Windows!
Uninterruptible Power Supplies
You probably don't typically carry an Uninterruptible Power Supply (UPS) with your notebook computer as you travel around. However, while I'm on the subject of power management, I might as well give you a brief look at UPS support in Windows XP.