<s>
VESA	B-General_Concept
Display	I-General_Concept
Power	I-General_Concept
Management	I-General_Concept
Signaling	I-General_Concept
(	O
or	O
DPMS	B-General_Concept
)	O
is	O
a	O
standard	O
from	O
the	O
VESA	O
consortium	O
for	O
power	O
management	O
of	O
video	O
monitors	B-Device
.	O
</s>
<s>
VESA	O
issued	O
DPMS	B-General_Concept
1.0	O
in	O
1993	O
,	O
basing	O
their	O
work	O
on	O
the	O
United	O
States	O
Environmental	O
Protection	O
Agency	O
's	O
(	O
EPA	O
)	O
earlier	O
Energy	O
Star	O
power	O
management	O
specifications	O
.	O
</s>
<s>
Subsequent	O
revisions	O
were	O
included	O
in	O
future	O
VESA	B-Device
BIOS	I-Device
Extensions	I-Device
.	O
</s>
<s>
DPMS	B-General_Concept
defines	O
four	O
modes	O
:	O
normal	O
,	O
standby	O
,	O
suspended	O
and	O
off	O
.	O
</s>
<s>
By	O
the	O
late	O
1990s	O
,	O
most	O
new	O
monitors	B-Device
implemented	O
at	O
least	O
one	O
DPMS	B-General_Concept
level	O
.	O
</s>
<s>
DPMS	B-General_Concept
does	O
not	O
define	O
implementation	O
details	O
of	O
its	O
various	O
power	O
levels	O
;	O
</s>
<s>
while	O
in	O
a	O
CRT-based	O
display	O
the	O
three	O
steps	O
could	O
logically	O
be	O
mapped	O
to	O
three	O
blocks	O
to	O
be	O
shut	O
down	O
in	O
order	O
of	O
increasing	O
savings	O
,	O
thermal	O
stress	O
,	O
and	O
warm-up	O
time	O
(	O
video	O
amplifier	O
,	O
deflection	O
,	O
filaments	O
)	O
not	O
all	O
designs	O
would	O
be	O
trivially	O
adaptable	O
to	O
this	O
model	O
,	O
and	O
neither	O
would	O
the	O
technologies	O
that	O
commercially	O
succeeded	O
CRT	O
monitors	B-Device
.	O
</s>
<s>
Partially	O
due	O
to	O
this	O
reason	O
,	O
most	O
major	O
operating	O
environments	O
(	O
such	O
as	O
Microsoft	O
Windows	O
and	O
the	O
MacOS	O
family	O
)	O
do	O
not	O
implement	O
the	O
3-level	O
DPMS	B-General_Concept
specification	O
either	O
,	O
offering	O
only	O
a	O
single	O
timer	O
.	O
</s>
<s>
DPMS	B-General_Concept
competed	O
with	O
the	O
alternative	O
Nutek	O
power	O
saving	O
system	O
,	O
in	O
which	O
the	O
monitor	O
recognizes	O
a	O
black	O
picture	O
produced	O
by	O
a	O
screensaver	B-General_Concept
and	O
enters	O
a	O
power	O
saving	O
mode	O
after	O
an	O
appropriate	O
delay	O
.	O
</s>
