Remember these tips when you set the screen saver:
• During times that you are using the flat-panel display
frequently, set the Screen Saver field to Off. This setting
ensures that the display does not invoke DPMS, which means
that you do not have to wait for the display to stabilize when
you begin to use it again.
• Set the Screen Saver field to On when you plan to be away
from the computer for several hours. With the screen saver
running, your system conserves energy, and the backlight in
the flat-panel display lasts longer.
Using the DPMS Screen Saver | 91