VESA Display Power Management Signaling
VESA Display Power Management Signaling (or DPMS) is a standard from the VESA consortium for managing the power supply of video monitors for computers through the graphics card. Example usage includes shutting off the monitor after a period of idle time to save power.
History[edit]
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[edit]
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 Sec. |
| Suspend | On | Off | < 30W | ~5 Sec. |
| Off | Off | Off | < 8W | ~20 Sec. |
See also[edit]
- Digital Monitor Power Management
- Screensaver
- DOS Protected Mode Services (DPMS) - unrelated memory management standard
References[edit]
- ^ PC User Guide: Chapter 8
- ^ On a Targa TM 3820 PNLD Monitor
External links[edit]
- VESA Display Power Management Signaling (DPMS) Standard (requires purchase of the specification)
- VESA Standards Listing
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