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This product has been discontinued: PowerMAN 5.1.x and later includes a built-in logout feature. PowerSAV is still applicable for environments without PowerMAN.

PowerSAV Logout Screen Saver

Overview

The PowerSAV Logout Screen Saver is designed to complement PowerMAN Power Manager and PowerMON Power Monitor. The tool is intended for use in larger multi-user environments where each user has a distinct logon such as:
  • University computer rooms
  • School ICT suites
In such multi-user environments the number of active users can fluctuate between zero and maximum many times during the day. It is often desirable to use active power management in such scenarios to ensure that equipment is either off or in a low power state when not required.

However, the desire to reduce energy costs can often conflict with practical or organisational requirements such as:
  • Computers should be available at specific times
  • Computers should be available within a few seconds (precluding a full shut-up sequence)
  • Users should not turn equipment on/off
  • Hardware supports scheduled wake from Hibernate (S4) or Sleep (S1-S3) states but not from shutdown (S5)
  • Sleep / hibernate are desirable but cannot be used because the current user session will be suspended (leaving the workstation unusable by a subsequent user)
Unfortunately the Windows power management architecture does not provide a ready method to solve these problems. PowerSAV is designed to remedy this situation by allowing the administrator to configure a user idle timeout that will result in the current user being logged off. This may be used in combination with the Power Manager NoUser policy to subsequently hibernate or sleep the workstation. Workstations that are configured to save energy in this way can be rapidly restored to operation and often can be configured to do this at specific times (which is usually not possible from a full shutdown).



Although PowerSAV has multiple uses it was original conceived for situations where a scheduled wake was desirable but the hardware did not support wake from the shutdown (S5) state. PowerSAV allows this problem to be worked around by using the hibernate (S4) or sleep (S1-S3) states instead. However, the direct use of these power saving modes could mean that an active user session would be suspended. Often this may cause problems in such multi-user environments because the user would not have saved their documents in an orderly fashion and a subsequent user would not be able to logon to the restored system due to the pre-existing session.

PowerSAV resolves this by logging out the user and therefore allowing the system to be suspended with no user logged on. This means that when the system is subsequently restored there is no previous user session to interfere with the next user.

PowerSAV Phases

PowerSAV is implemented as a screen saver application that combines the traditional functionality expected from a screen saver with the ability to log the user out after a preset time. PowerSAV has three distinct phases of operation:

Data Synergy PowerSav Phases

The Initial Timeout specifies the period that will elapse before PowerSAV is activated. Any user activity during this period resets the timer to zero again (in other words the user must be totally inactive for the initial period for the next stage to be reached)

The optional Monitor Timeout specifies a period during which the monitor is turned off. Any user activity during this period restores the monitor power and cancels any further action.

The optional Warning Timeout specifies a period during which a warning is displayed to the user indicating that a logout is pending. Any user activity during this period cancels the logout.

Finally, if no user activity occurs the user is logged out.

The Monitor Off phase may be used to reduce power consumption without logging the user out. This allows PowerSAV to be used instead of a traditional screen saver.


Current PowerSAV Manual PowerSav Logout Screen Saver Manual v5.2