Microsoft Windows 3.x
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POWER MANAGEMENT SCREEN SAVER
The Display Power Manager for Windows 3.x provides a mechanism to control the amount of power
used by a computer's monitor. It provides a total of 5 levels of power savings.
The first level is a conventional screen saver that turns the screen black and bounces a logo around.
The black screen provides substantial power savings and the animation lets you know that the
computer is still active.
The other four levels of power savings are:
Reduced on mode - Reduced on mode is an optional power saving state that allows the computer to
use some power savings while still fully operational. Currently this is limited to some portable
computers that can lower the power usage on their LCD displays. This causes some degradation of
display quality.
Stand by mode - Stand by mode is an optional power saving state that gives minimal power savings,
but provides the fastest recovery time.
Suspend mode - Suspend mode is a mandatory state in which substantial power savings are
achieved by the display. The trade off is that recovery times are longer than from stand by mode.
Off mode - Off mode provides the highest level of power savings and the longest recovery times.
With this mode the display is actually turned off so that recovery times are equivalent to switching the
monitor on.
These four levels match the power saving modes defined by the VESA VBE/PM standard. As you
move down from one mode to the next, the amount of power being saved is greater, but so is the
amount of time that it takes for a monitor to recover and be ready to display data.
The screen saver will cycle through all of the selected power saving modes one after another until the
maximum selected power saving mode has been reached. You can specify the number of minutes
each level is active. The number of minutes you specify for each level is the number of minutes after
the previous mode has been enabled. It is not the total time before entering that mode.
1. Using the Windows Control Panel, select Desktop.
2. In the group Screen Saver within the Desktop dialog box, select the Screen Saver named Display
Power Manager.
3. Select the desired delay before entering a power saving mode.
Select Setup to further configure the power saving options. The following sections describe these
options. For further information on setting up Windows screen savers, please refer to the Windows
User Guide.
Special Considerations
Some of the power saving modes are intended for specific display types, so not all of them are
available on all video controllers. On some controllers, only the animated logo will be available.
For the power saving modes to have any effect beyond just blanking the screen, the monitor being
used must have specific power saving features.
Note that if the screen saver is in any of the power saving modes, moving the mouse will not wake
it up. This is different from normal screen savers and is used to keep the monitor from waking up
because of accidents such as bumping the desk that the computer is sitting on. This is especially
important if the password option is enabled, since once the password dialog box pops up, it stays
there until the user turns it off. This is a limitation of the Windows 3.x screen saver interface.
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