Appendix H Compaq/Matrox G200 MMS Quad-Head PCI Graphics Card

H.6 POWER MANAGEMENT AND CONSUMPTION

This controller provides monitor power control for monitors that conform to the VESA display power management signaling (DPMS) protocol. This protocol defines different power consumption conditions and uses the HSYNC and VSYNC signals to select a monitor’s power condition. Table H-2 lists the monitor power conditions.

Table H-2.Monitor Power Management Conditions

 

 

 

Table H-2.

 

 

Monitor Power Management Conditions

HSYNC

VSYNC

Power Mode

Description

Active

Active

On

Monitor is completely powered up. If activated, the inactivity

 

 

 

counter counts down during system inactivity and if allowed to

 

 

 

tiemout, generates an SMI to initiate the Suspend mode.

Active

Inactive

Suspend

Monitor’s high voltage section is turned off and CRT heater

 

 

 

(filament) voltage is reduced from 6.6 to 4.4 VDC. The Off mode

 

 

 

inactivity timer counts down from the preset value and if allowed

 

 

 

to timeout, another SMI is generated and serviced, resulting in

 

 

 

the monitor being placed into the Off mode. Wake up from

 

 

 

Suspend mode is typically a few seconds.

Inactive

Inactive

Off

Monitor’s high voltage section and heater circuitry is turned off.

 

 

 

Wake up from Off mode is a little longer than from Suspend.

H-6Compaq Personal Computers

Original - March 2002

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Image 221
Compaq W4000 manual Power Management and Consumption, Table H-2