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HP and Compaq Desktop PCs - Power Management Overview (Windows XP)

This document describes power management modes for HP and Compaq computers using Microsoft Windows XP. The computer supports many different options, connections, and configurations which might result in different power management behavior.
Power management modes
Your computer supports the following power management modes. Refer to the following table (in order of power consumption):
State
Mode
Description
S0
Working
System is on and fully operational.
System appears off, but the computer is kept operational. The display is blank and the audio is mute.
S1
Standby (Not normally used)
System appears off. The CPU is stopped; RAM is refreshed; the system is running in a low power mode. This state can operate when a card or peripheral does not recognize S3.
S2
Standby (Not normally used)
System appears off. The CPU has no power; RAM is refreshed; the system is in a lower power mode than S1.
S3
Standby (Normally used)
System appears off. The CPU has no power; RAM is in self refresh; the power supply is in a reduced power mode. This mode is also referred to as 'Save To RAM'.
S4
System appears off. The hardware is completely off, but the system memory has been saved as a temporary file onto the hard disk. This mode is also referred to as 'Save To Disk'.
S5
Off
System is off. The hardware is completely off, the operating system has shut down; nothing has been saved. Requires a complete reboot to return to the Working state. The clock works.
Reduced power consumption modes are described as follows:
Away mode
Your computer comes with the Away mode disabled by default. When the computer is in Away mode:
  • The computer can still perform tasks such as recording scheduled TV programs or stream video and music files to a remote location.
  • The display is turned off.
  • Audio is muted.
  • The computer is operational but in a reduced-power setting.
  • The computer fan runs.
  • The desktop can be displayed almost instantly when you press the sleep button on your remote control.
Standby and Away modes
You can use both Standby and Away modes to save power when the computer is not in use. There are some differences between these settings.
You can enable both Standby mode set and Away mode so that after a determined time-out period in away mode, the computer reverts to Standby mode; which places the computer in a reduced power state.
If you have both Standby mode and Away mode set, Standby mode will override Away mode unless the TV tuner is active (for example, recording or playing live TV). The computer does not time-out to Standby mode; it remains in Away mode and the fan remains running.
Enabling Away Mode
To enable Away mode:
  1. Click Start on the taskbar, click Control Panel, click Performance and Maintenance, and then click Power Options.
  2. Select the Away tab.
    Figure : Power Options window with Away tab selected
    Power Options Properties window with Enable Away mode selected.
  3. Place a check mark in the Enable Away mode check box.
  4. Under Options you can place a check mark next to the following options:
    Return the computer from Away mode on mouse or keyboard activity
    Or
    Prompt for password when the computer returns from Away mode
  5. Click OK.
  6. Restart the computer for the power settings to take effect.
     note:
    Selecting the option Return the computer from Away mode on mouse or keyboard activity is not recommended, as this resumes the computer out of Away mode if the keyboard or trackball is slightly moved. After you have enabled Away mode in the Control Panel, you can activate or wake the computer from Away mode by pressing the Power button on the computer, or by pressing the standby button on the keyboard or remote control.
    If the Away tab is unavailable, the computer does not support this feature.
Standby mode
Standby (or Sleep) mode is a fast-on power-saving mode that allows quick-resume response time and, at the same time, lowers power-consumption. While on standby, your entire computer switches to a low-power state where devices, such as the monitor and hard disks, turn off and your computer uses less power. It is most suitable for users who want power-saving features but need the computer to resume normal operation quickly.
If you plan to be away from your computer for a while, you put your computer on standby, which puts your entire system in a low-power state. Any mouse/keyboard or I/O action enables the system to exit Standby mode and return quickly to normal operation. When you want to use the computer again, it comes out of standby quickly, and your desktop is restored exactly as you left it.
The standby low power state that a computer enters automatically after a period of inactivity or by manual selection can quickly “wake” in response to inputs from network connections or user interface devices. Computers may have more than one Standby mode, but the lowest power Standby mode (S3) is usually applied.
When the computer is in Standby (S3) mode:
  • The display is turned off, audio is muted, the fan and the hard disk are turned off, and the computer is set to a minimal power-setting.
  • The computer can still perform tasks such as recording a scheduled TV program.
  • The desktop can be displayed after several seconds when you press a button on your keyboard or remote control, such as the "sleep" button.
Changing the Standby Mode Power Setting
Your computer comes with the Standby mode set to 25 minutes of inactivity by default.
To change Standby mode settings:
  1. Click Start on the taskbar, click Control Panel, click Performance and Maintenance, and then click Power Options.
  2. Select the Power Schemes tab.
  3. Select your settings by clicking the drop-down arrows.
  4. Click OK.
  5. Restart the computer for the power settings to take effect.
    Figure : Power Schemes window
    Power Options Properties window with Power Schemes tab selected.
Hibernate mode
S4/Hibernate is a "sleep state" in which data is moved from system memory to the hard disk. This enables a system to 'wake' quickly while still helping to maintain data since you are not subject to power outages like you are when a system is in a screen saver mode, in S1 or in Standby (S3).
Hibernate mode sends the CPU and all peripherals into the lowest power-consumption mode possible. However, it takes a longer time for the system to resume normal operation depending on the fixed disk drive and monitor type in use.
The hibernate feature saves everything in memory on disk, turns off your monitor and hard disk, and then turns off your computer. When you restart your computer, your desktop is restored exactly as you left it. It takes longer to bring your computer out of hibernation than out of standby.
Typically, you turn off your monitor or hard disk for a short period to conserve power. Put your computer in hibernation when you will be away from the computer for an extended time or overnight. When you restart the computer by touching a key or button, your desktop is restored exactly as you left it.
Set the Suspend Mode timer to a value from 2 to 120 minutes, or activate the Suspend/Resume button. Activating the Suspend/Resume button produces two beeps as the system enters the suspend mode. Any keyboard/mouse or I/O action resumes full power.
Enabling Hibernate mode
To automatically put your computer into hibernation:
  1. Make sure the following conditions are met:
    • You must be logged on as an administrator or a member of the Administrators group in order to complete this procedure.
    • If your computer is connected to a network, network policy settings might also prevent you from completing this procedure.
  2. Click Start, click Control Panel, click Performance and Maintenance, and then click Power Options.
  3. Click the Hibernate tab, select the Enable hibernation check box, and then click Apply.
    Figure : Hibernate Power Options window
    Power Options Properties window with the Hibernate tab selected.
    If the Hibernate tab is unavailable, your computer does not support this feature.
  4. Click the Power Schemes tab, and then select a time period in System hibernates. Your computer hibernates after it has been idle for the specified amount of time.
Manually putting your computer into hibernation
To manually put your computer into hibernation:
  1. Click Start on the taskbar, click Control Panel, click Performance and Maintenance, and then click Power Options.
  2. Click the Hibernate tab, and then select the Enable hibernate support check box. If the Hibernate tab is not available, your computer does not support this feature.
  3. Click OK to close the Power Options dialog box.
  4. Click Start on the taskbar, and then click Shut Down.
  5. In the "What do you want the computer to do" drop-down list, click Hibernate.
Selecting Power Schemes
A power scheme is a collection of settings that manages the power usage by the computer. You can reduce the power consumption of your computer devices or of your entire system by choosing a power scheme. You can create your own power schemes or use the ones provided with Windows. You can also adjust the individual settings in a power scheme.
Your computer includes the following available power schemes:
  • Home/Office Desk - Typically used for desktop computers.
  • Portable/Laptop - Not used for desktop computers.
  • Presentation - Only used for desktop computers in demo mode such as in a store.
  • Always On - Rarely used for desktop computers.
  • Minimal Power Management - Rarely used for desktop computers.
  • Max Battery - Not used for desktop computers.
  • Energy Star - Energy Star is an EPA (United States Environmental Protection Agency) performance requirement for laptops, workstations, desktop computers, integrated computers, and servers. This is typically the default setting.
Selecting a power scheme changes the settings at the bottom of the window. To modify the selected power scheme, select the scheme, change the settings, then click Apply and OK.
Figure : Power Schemes window
Power Options Properties window with the Power Schemes tab selected.

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