VESA Display Power Management Signaling: Difference between revisions
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{{Short description|Standard for power management of computer monitors}} | |||
'''VESA Display Power Management Signaling''' ('''VESA DPMS''') is a [[standardization|standard]] from the [[VESA]] consortium for power management of video [[Computer display|monitors]]. Example usage includes turning off, or putting the monitor into standby after a period of idle time to save power. Some commercial displays also incorporate this technology. | '''VESA Display Power Management Signaling''' ('''VESA DPMS''') is a [[standardization|standard]] from the [[VESA]] consortium for power management of video [[Computer display|monitors]]. Example usage includes turning off, or putting the monitor into standby after a period of idle time to save power. Some commercial displays also incorporate this technology. | ||
== History == | == History == | ||
VESA issued DPMS 1.0 in 1993,<ref>{{Cite web |url=http://eetd.lbl.gov/EA/Reports/39466/39466-8 |title=PC User Guide: Chapter 8<!-- Bot generated title --> |access-date=2007-04-16 |archive-url=https://web.archive.org/web/20111122155220/http://eetd.lbl.gov/EA/Reports/39466/39466-8 |archive-date=2011-11-22 |url-status=dead | VESA issued DPMS 1.0 in 1993,<ref>{{Cite web |url=http://eetd.lbl.gov/EA/Reports/39466/39466-8 |title=PC User Guide: Chapter 8<!-- Bot generated title --> |access-date=2007-04-16 |archive-url=https://web.archive.org/web/20111122155220/http://eetd.lbl.gov/EA/Reports/39466/39466-8 |archive-date=2011-11-22 |url-status=dead }}</ref> basing their work on the [[United States Environmental Protection Agency]]'s (EPA) earlier [[Energy Star]] [[power management]] specifications. Subsequent revisions were included in future [[VESA BIOS Extension]]s. | ||
== Design == | == Design == | ||
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== External links == | == External links == | ||
* [http://www.vesa.org/Standards/summary/2003_3b.htm VESA Display Power Management Signaling (DPMS) Standard] (requires purchase of the specification) | * [http://www.vesa.org/Standards/summary/2003_3b.htm VESA Display Power Management Signaling (DPMS) Standard] {{Webarchive|url=https://web.archive.org/web/20100516041050/http://www.vesa.org/Standards/summary/2003_3b.htm |date=2010-05-16 }} (requires purchase of the specification) | ||
* [https://web.archive.org/web/20120627050710/http://www.vesa.org/vesa-standards/standards-summaries/ VESA Standards Listing] | * [https://web.archive.org/web/20120627050710/http://www.vesa.org/vesa-standards/standards-summaries/ VESA Standards Listing] | ||
Latest revision as of 23:10, 29 September 2025
Template:Short description VESA Display Power Management Signaling (VESA DPMS) is a standard from the VESA consortium for power management of video monitors. Example usage includes turning off, or putting the monitor into standby after a period of idle time to save power. Some commercial displays also incorporate this technology.
History
VESA issued DPMS 1.0 in 1993,[1] basing their work on the United States Environmental Protection Agency's (EPA) earlier Energy Star power management specifications. Subsequent revisions were included in future VESA BIOS Extensions.
Design
The standard defines how to signal the H-sync and V-sync pins in a standard SVGA monitor to trigger the monitor's power saving capabilities.
DPMS defines four modes: normal, standby, suspended and off. When in the "off" state, some power may still be drawn in order to power indicator lights.
The standard is:
| State | H-sync | V-sync | Power | Recovery time[2] |
|---|---|---|---|---|
| On | On | On | 100% | n/a |
| Stand-by | Off | On | < 80% | ~1 s |
| Suspend | On | Off | < 30 W | ~5 s |
| Off | Off | Off | < 8 W | ~20 s |
Reception
By the late 1990s, most new monitors implemented at least one DPMS level.Script error: No such module "Unsubst".
DPMS does not define implementation details of its various power levels;[3] while in a CRT-based display the three steps could logically be mapped to three blocks to be shut down in order of increasing savings, thermal stress, and warm-up time (video amplifier, deflection, filaments) not all designs would be trivially adaptable to this model, and neither would the technologies that commercially succeeded CRT monitors.
Partially due to this reason, most major operating environments (such as Microsoft Windows and the MacOS family) do not implement the 3-level DPMS specification either, offering only a single timer. Notable exceptions include X11[4] and the XFCE Power Manager.[5]
DPMS competed with the alternative Nutek power saving system, in which the monitor recognizes a black picture produced by a screensaver and enters a power saving mode after an appropriate delay.[6]
See also
References
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Script error: No such module "Check for unknown parameters".
External links
- VESA Display Power Management Signaling (DPMS) Standard Template:Webarchive (requires purchase of the specification)
- VESA Standards Listing