DPMSGetVersion - returns the version of the DPMS extension implemented by the X server

display
              Specifies the connection to the X server

       major_version
              Specifies the return location for the extension major version

       minor_version
              Specifies the return location for the extension minor version

       The  DPMSGetVersion  function  returns  the  version  of  the  Display  Power Management Signaling (DPMS)
       extension implemented by the X server.  It returns a major and minor version number.  The  major  version
       number  will  be  incremented  for  protocol  incompatible  changes, and the minor version number will be
       incremented for small, upward compatible changes.

       DPMSGetVersion - returns the version of the DPMS extension implemented by the X server

       TRUE           The DPMSGetVersion function returns TRUE when the extension is supported  and  values  are
                      returned.

       FALSE          The DPMSGetVersion function returns FALSE when the extension is not supported.

DPMSCapable(3), DPMSQueryExtension(3)

X Version 11                                      libXext 1.3.4                                DPMSGetVersion(3)

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

       StatusDPMSGetVersion
              (
                    Display *display,
                    int *major_version,
                    int *minor_version
              );