DPMSForceLevel - forces a DPMS capable display into the specified power level

display
              Specifies the connection to the X server

       level  Specifies the level to force power to

       The DPMSForceLevel function forces a DPMS capable display into the specified power level.  The level must
       be  one  of  following  four states: DPMSModeOn, DPMSModeStandby, DPMSModeSuspend, or DPMSModeOff. Values
       other than these will result in a BadValue error.  If DPMS is disabled on the display, trying to set  the
       power level on the display will result in a BadMatch protocol error.

       BadValue       A  level  other  than  DPMSModeOn,  DPMSModeStandby,  DPMSModeSuspend,  or DPMSModeOff was
                      specified.

       BadMatch       DPMS is disabled on the specified display.

       DPMSForceLevel - forces a DPMS capable display into the specified power level

       TRUE           The DPMSForceLevel function always returns TRUE.

DPMSCapable(3), DPMSInfo(3), DPMSGetTimeouts(3), DPMSSetTimeouts(3)

X Version 11                                      libXext 1.3.4                                DPMSForceLevel(3)

cc [ flag ... ] file ... -lXext [ library ... ]
       #include <X11/extensions/dpms.h>

       StatusDPMSForceLevel ( Display *display, CARD16 level );