IBM T 541 - Manual (Page 22)

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To benefit from power management, the monitor must be used in
conjunction with a computer that implements the Video Electronics
Standards Association (VESA) Display Power Management Signaling
(DPMS) Standard.
The power management feature is invoked when the computer recognizes
that you have not used your mouse or keyboard for a user-definable period.
There are several states as described in the table below.
As an E NERGY STAR 2000 ® Partner, IBM has determined that this product
meets the E NERGY STAR 2000 ® guidelines for energy efficiency.
IBM recommends that you switch off your monitor at the end of each
working day, or whenever you expect to leave it unused for long periods
during the day.
Power Management
On
Active off
State
Power
Indicator
Steady green Normal
Blank Steady amber
Screen
Restoring
Operation
Compliance
Press a key or
move the mouse.‡
E NERGY
S TAR 2000 ®
‡ There may be a slight delay before the picture reappears.