Compaq 7500 Series Reference Manual page 20

Operation
Your monitor's energy saver feature works only when your monitor is connected to a
computer that also has energy saver features.
The Energy Saver utility, with its energy saving features, is available with all Microsoft
Windows operating systems. Some features are also available in DOS. Refer to your
computer's user guide for instructions on setting energy saver features (also referred to as
power management features).
Reference Guide 4–7