DPMSInfo - returns information about the current DPMS state
cc [ flag ... ] file ... -lXext [ library ... ]
#include <X11/extensions/dpms.h>
Status DPMSInfo
(
      Display *display,
      CARD16 *power_level,
      BOOL *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.)
  - TRUE
- The DPMSInfo function returns TRUE, if values are returned.
- FALSE
- The DPMSInfo function returns FALSE, if no values are
    returned.