VESA Display Power Management Signaling

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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 e.g; shut off the monitor after the computer has been unused for some time (idle), to save power.

Contents 1 History 2 Design 3 See also 4 References 5 External links

[edit] History

DPMS 1.0 was issued by VESA in 1993 ^[1], and was based on the United States Environmental Protection Agency's (EPA) earlier Energy Star power management specifications. Subsequent revisions were rolled into future VESA BIOS Extensions.

[edit] 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. In off some power may still be drawn in order to power indicator lights. The standard is:

	H-sync	V-sync	Power	Recovery Time[2]
Turned on	On	On	100 %	n/a
Stand-by	Off	On	< 80 %	~1 Sec.
Suspend	On	Off	< 30W	~5 Sec.
Turned off	Off	Off	< 8W	~20 Sec.

[edit] See also

• List of computer standards
• Screensaver

[edit] References

[edit] External links

• VESA Display Power Management Signaling (DPMS) Standard, requires purchase of the specification

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