; Need for stroke " Local $hWnd = _WinAPI_GetDesktopWindow() "
#include <WinAPISys.au3>

; Need for stroke " Local $tPhysicalMonitor = DllStructCreate(_StringRepeat($tag_PHYSICAL_MONITOR, $iNumberMonitor)) "
#include <String.au3>

; Need for stroke " Local $aPos, $aData = _WinAPI_EnumDisplayMonitors() "
; Need for stroke " $hMonitor = _WinAPI_MonitorFromWindow($hWnd, $MONITOR_DEFAULTTONEAREST) "
#include <WinAPIGdi.au3>

Local $aPos, $aData = _WinAPI_EnumDisplayMonitors()

Local $hWnd = _WinAPI_GetDesktopWindow()
$hMonitor = _WinAPI_MonitorFromWindow($hWnd, $MONITOR_DEFAULTTONEAREST)

Local $aRet = DllCall("Dxva2.dll", "int", "GetNumberOfPhysicalMonitorsFromHMONITOR", "handle", $hMonitor, "int*", 0)
Local $iNumberMonitor = $aRet[2]
Const $tag_PHYSICAL_MONITOR = "handle hPhysicalMonitor; wchar strPhysicalMonitorDescription[128];"
Local $tPhysicalMonitor = DllStructCreate(_StringRepeat($tag_PHYSICAL_MONITOR, $iNumberMonitor))
$aRet = DllCall("Dxva2.dll", "int", "GetPhysicalMonitorsFromHMONITOR", "handle", $hMonitor, "int", $iNumberMonitor, "struct*", $tPhysicalMonitor)

; Off monitor

$aRet = DllCall("Dxva2.dll", "int", "SetVCPFeature", "handle", $tPhysicalMonitor.hPhysicalMonitor, _
  "byte", 0xD6, "int", 0x04)

; On monitor

DllCall("Dxva2.dll", "int", "SetVCPFeature", "handle", $tPhysicalMonitor.hPhysicalMonitor, _
  "byte", 0xD6, "int", 0x01)