DPMSInfo - returns information about the current DPMS state

display
              Specifies the connection to the X server

       power_level
              Specifies the current power level

       state  Specifies the current DPMS state

       The  DPMSInfo  function  returns  information about the current Display Power Management Signaling (DPMS)
       state. The state return parameter indicates whether or not DPMS is enabled (TRUE)  or  disabled  (FALSE).
       The  power_level  return parameter indicates the current power level (one of DPMSModeOn, DPMSModeStandby,
       DPMSModeSuspend, or DPMSModeOff.)

       DPMSInfo - returns information about the current DPMS state

       TRUE           The DPMSInfo function returns TRUE, if values are returned.

       FALSE          The DPMSInfo function returns FALSE, if no values are returned.

DPMSEnable(3)

X Version 11                                      libXext 1.3.4                                      DPMSInfo(3)

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

       StatusDPMSInfo
              (
                    Display *display,
                    CARD16 *power_level,
                    BOOL *state
              );