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BOOL DeviceIoControl(
  (HANDLE) hDevice,                // handle to device
  IOCTL_VIDEO_QUERY_SUPPORTED_BRIGHTNESS,  // dwIoControlCode
  NULL,                            // lpInBuffer
  0,                               // nInBufferSize
  (LPVOID) lpOutBuffer,            // output buffer
  (DWORD) nOutBufferSize,          // size of output buffer
  (LPDWORD) lpBytesReturned,       // number of bytes returned
  (LPOVERLAPPED) lpOverlapped      // OVERLAPPED structure
);                    

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//BenBE: LCD Brightness Control
//  Note: This functions are available on WinXP SP1 and Win2K3 only,
//  because the used IOCTL-codes were introduced with windows versions.
//  TODO -oBenBE -cInc, Scrn, LCD : Brightness Support, WinXP SP1 DDK or ntddvdeo.h needed
//  MSG BenBE@All : Suche Kopie eines M$ WinXP DDK :D
//  Oder folgende Konstanten der ntddvdeo.h:
//      IOCTL_VIDEO_QUERY_SUPPORTED_BRIGHTNESS
//      IOCTL_VIDEO_QUERY_DISPLAY_BRIGHTNESS
//      IOCTL_VIDEO_SET_DISPLAY_BRIGHTNESS

//Information obtained from the WinXP SP1 DDK:
Const
    //#define CTL_CODE( DeviceType, Function, Method, Access ) (((DeviceType) << 16) | ((Access) << 14) | ((Function) << 2) | (Method) )
    //#define FILE_DEVICE_VIDEO               0x00000023
    FILE_DEVICE_VIDEO = $23;
    //#define METHOD_BUFFERED                 0
    METHOD_BUFFERED = 0;
    //#define FILE_ANY_ACCESS                 0
    FILE_ANY_ACCESS = 0;
    //#define IOCTL_VIDEO_QUERY_SUPPORTED_BRIGHTNESS CTL_CODE(FILE_DEVICE_VIDEO, 0x125, METHOD_BUFFERED, FILE_ANY_ACCESS)
Const
    IOCTL_VIDEO_QUERY_SUPPORTED_BRIGHTNESS =
        FILE_DEVICE_VIDEO Shl 16 Or
        $125 Shl 2 Or
        METHOD_BUFFERED Shl 14 Or
        FILE_ANY_ACCESS;
    //#define IOCTL_VIDEO_QUERY_DISPLAY_BRIGHTNESS CTL_CODE(FILE_DEVICE_VIDEO, 0x126, METHOD_BUFFERED, FILE_ANY_ACCESS)
Const
    IOCTL_VIDEO_QUERY_DISPLAY_BRIGHTNESS =
        FILE_DEVICE_VIDEO Shl 16 Or
        $126 Shl 2 Or
        METHOD_BUFFERED Shl 14 Or
        FILE_ANY_ACCESS;
    //#define IOCTL_VIDEO_SET_DISPLAY_BRIGHTNESS CTL_CODE(FILE_DEVICE_VIDEO, 0x127, METHOD_BUFFERED, FILE_ANY_ACCESS)
Const
    IOCTL_VIDEO_SET_DISPLAY_BRIGHTNESS =
        FILE_DEVICE_VIDEO Shl 16 Or
        $127 Shl 2 Or
        METHOD_BUFFERED Shl 14 Or
        FILE_ANY_ACCESS;

    //typedef struct _DISPLAY_BRIGHTNESS {
    //  UCHAR ucDisplayPolicy;
    //  UCHAR ucACBrightness;
    //  UCHAR ucDCBrightness;
    //} DISPLAY_BRIGHTNESS, *PDISPLAY_BRIGHTNESS;
Type
    TDisplayBrightness = Packed Record
        ucDisplayPolicy: Byte;
        ucACBrightness: Byte;
        ucDCBrightness: Byte;
    End;

    //TODO 4 -oBenBE -cInc, Scrn, LCD : DISPLAYPOLICY-Werte korrigieren!
    //DISPLAYPOLICY_AC
    //DISPLAYPOLICY_DC
    //DISPLAYPOLICY_BOTH
Const
    DISPLAYPOLICY_AC = 1;
    DISPLAYPOLICY_DC = 2;
    DISPLAYPOLICY_BOTH = 3;

Function IsLCDAvailable: Boolean;
Function IsLCD_ACBrightnessSupported(Level: Byte): Boolean;
Function IsLCD_DCBrightnessSupported(Level: Byte): Boolean;
Function GetLCD_ACBrightnessLevel: Byte;
Function GetLCD_DCBrightnessLevel: Byte;
Function GetLCD_CurrBrightnessLevel: Byte;
Function SetLCD_ACBrightnessLevel(Level: Byte): Boolean;
Function SetLCD_DCBrightnessLevel(Level: Byte): Boolean;
Function SetLCD_BothBrightnessLevel(Level: Byte): Boolean;

{...}

Const
    LCDDeviceFile = '\\.\LCD';

Function IsLCDAvailable: Boolean;
Var
    LCDHandle: HFILE;
Begin
    Result := False;
    LCDHandle := CreateFile(LCDDeviceFile, 0, FILE_SHARE_READ Or FILE_SHARE_WRITE, Nil, OPEN_EXISTING, 0, 0);
    Try
        Result := IsValidHandle(LCDHandle);
    Finally
        If Result Then
            CloseHandle(LCDHandle);
    End;
End;

Function IsLCD_ACBrightnessSupported(Level: Byte): Boolean;
Var
    LCDHandle: HFILE;
    BufSize: DWORD;
    Buf: Array Of Byte;
    X: Integer;
Begin
    Result := False;

    If Not IsLCDAvailable Then
        Exit;

    LCDHandle := CreateFile(LCDDeviceFile, 0, FILE_SHARE_READ Or FILE_SHARE_WRITE, Nil, OPEN_EXISTING, 0, 0);
    Try
        BufSize := 256;
        SetLength(Buf, BufSize);
        If Not DeviceIoControl(LCDHandle, IOCTL_VIDEO_QUERY_SUPPORTED_BRIGHTNESS, Nil, 0, @Buf[0], BufSize, BufSize, Nil) Then
            Exit;
        SetLength(Buf, BufSize);
        // TODO -oBenBE -cInc, Scrn, LCD : Optimize IsLCD_ACBrightnessSupported by using ASM
        For X := 0 To BufSize - 1 Do
            If Buf[X] = Level Then
            Begin
                Result := True;
                Exit;
            End;
    Finally
        CloseHandle(LCDHandle);
    End;
End;

Function IsLCD_DCBrightnessSupported(Level: Byte): Boolean; Assembler;
Asm
    CALL IsLCD_ACBrightnessSupported
End;

Function GetLCD_ACBrightnessLevel: Byte;
Var
    LCDHandle: HFILE;
    DispBrightness: TDisplayBrightness;
    BufSize: DWORD;
Begin
    Result := 0;

    If Not IsLCDAvailable Then
        Exit;

    LCDHandle := CreateFile(LCDDeviceFile, 0, FILE_SHARE_READ Or FILE_SHARE_WRITE, Nil, OPEN_EXISTING, 0, 0);
    Try
        BufSize := SizeOf(DispBrightness);
        If Not DeviceIoControl(LCDHandle, IOCTL_VIDEO_QUERY_DISPLAY_BRIGHTNESS, Nil, 0, @DispBrightness, BufSize, BufSize, Nil) Then
            Exit;
        Result := DispBrightness.ucACBrightness;
    Finally
        CloseHandle(LCDHandle);
    End;
End;

Function GetLCD_DCBrightnessLevel: Byte;
Var
    LCDHandle: HFILE;
    DispBrightness: TDisplayBrightness;
    BufSize: DWORD;
Begin
    Result := 0;

    If Not IsLCDAvailable Then
        Exit;

    LCDHandle := CreateFile(LCDDeviceFile, 0, FILE_SHARE_READ Or FILE_SHARE_WRITE, Nil, OPEN_EXISTING, 0, 0);
    Try
        BufSize := SizeOf(DispBrightness);
        If Not DeviceIoControl(LCDHandle, IOCTL_VIDEO_QUERY_DISPLAY_BRIGHTNESS, Nil, 0, @DispBrightness, BufSize, BufSize, Nil) Then
            Exit;
        Result := DispBrightness.ucDCBrightness;
    Finally
        CloseHandle(LCDHandle);
    End;
End;

Function GetLCD_CurrBrightnessLevel: Byte;
Var
    LCDHandle: HFILE;
    DispBrightness: TDisplayBrightness;
    BufSize: DWORD;
Begin
    Result := 0;

    If Not IsLCDAvailable Then
        Exit;

    LCDHandle := CreateFile(LCDDeviceFile, 0, FILE_SHARE_READ Or FILE_SHARE_WRITE, Nil, OPEN_EXISTING, 0, 0);
    Try
        BufSize := SizeOf(DispBrightness);
        If Not DeviceIoControl(LCDHandle, IOCTL_VIDEO_QUERY_DISPLAY_BRIGHTNESS, Nil, 0, @DispBrightness, BufSize, BufSize, Nil) Then
            Exit;
        If DispBrightness.ucDisplayPolicy = DISPLAYPOLICY_AC Then
            Result := DispBrightness.ucACBrightness
        Else If DispBrightness.ucDisplayPolicy = DISPLAYPOLICY_DC Then
            Result := DispBrightness.ucDCBrightness;
    Finally
        CloseHandle(LCDHandle);
    End;
End;

Function SetLCD_ACBrightnessLevel(Level: Byte): Boolean;
Begin
    // TODO -oBenBE -cInc, Scrn, LCD : SetLCD_ACBrightnessLevel implementieren
    Result := False;

    If Not IsLCDAvailable Then
        Exit;
End;

Function SetLCD_DCBrightnessLevel(Level: Byte): Boolean;
Begin
    // TODO -oBenBE -cInc, Scrn, LCD : SetLCD_DCBrightnessLevel implementieren
    Result := False;

    If Not IsLCDAvailable Then
        Exit;
End;

Function SetLCD_BothBrightnessLevel(Level: Byte): Boolean;
Begin
    // TODO -oBenBE -cInc, Scrn, LCD : SetLCD_BothBrightnessLevel implementieren
    Result := False;

    If Not IsLCDAvailable Then
        Exit;
End;                    

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WmiSetBrightness(1,100);                    

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[Fehler] Unit1.pas(159): Undefinierter Bezeichner: 'WmiSetBrightness'