There are command-line parameters that allow you to do some of this.

  ddm.exe /IncControl 10  //to increase brightness

  ddm.exe /IncControl 12  //to increase contrast

  ddm.exe /DecControl 10  //to decrease brightness

  ddm.exe /DecControl 12  //to decrease contrast

Use in conjunction with ordinary Windows shortcuts to bind to hotkeys of your choice.

The current release of DDM documents most of the command language in the readme that shown when you install it.  

Command language
-----------------------------------
A rich and flexible command language is supported via the
command-line, and command-line arguments can be combined.
Where appropriate, a specific display can be targeted by
prefacing the command with the display number, e.g.,
"2:AutoSetup"; if a display number is not specified the
command will be applied to the current selected display
or to all displays, as appropriate. Commands include:
 
SetActiveInput [DVI2/HDMI/DP2,etc] - switches active input
SetControl X Y - sets hex control X to hex value Y
IncControl X Y - increases the value of control X by Y
DecControl X Y - decreases the value of control X by Y
RestoreFactoryDefaults - restores factory defaults*
AutoSetup - executes an autosetup (analog only)*
RestoreLevelDefaults - restores level defaults*
RestoreColorDefaults - restores color defaults*
SetBrightnessLevel X - sets brightness to X% (0-100)*
SetContrastLevel X - sets contrast to X% (0-100)*
SetNamedPreset [Movie/CAL1,etc] - changes the Preset mode*
SetPowerMode [on/off] - sets the display power mode*
SetOptimalResolution - switches to optimal resolution
SaveProfile [Name] - save VCP(s) to named profile*
RestoreProfile [Name] - restore VCP(s) from named profile*
DeleteProfile [Name] - delete named profile
SetGridType - changes Easy Arrange grid type to X
Rescan - rescans display hardware
Exit - terminates the program
 
Some of these commands require familiarity with the MCCS
standard. For example, the command to switch the OSD
language to Spanish would be "SetControl CC 0A"; to unlock
an OSD that has been inadvertently locked "SetControl CA 02".
 
Instructions can be combined on the command-line, and
assigned to standard Windows shortcuts with optional hotkeys.
For example:
 
  "ddm.exe /RestoreLevelDefaults /2:SetContrastLevel 70"
 
would first restore level defaults on all monitors, and then
set the contrast level on monitor #2 to 70%.
 
NB: If not targeted to a specific monitor, commands listed
above that are tagged with an asterisk (*) apply to all
monitors to facilitate simple and uniform control over all
members of a multimonitor matrix. For instance, if executed
on a matrix of 16 identical monitors, the command-line:
 
  "ddm.exe /SetNamedPreset Warm /SetBrightnessLevel 75"
 
would set all 16 monitors to Warm preset mode, with a
brightness level of 75%.

What do you mean by "nothing happens"? You aren't specifying a value to increase brightness by, so it will default to 1 - which would hardly be noticeable. Instead of "/IncControl 10", try "IncControl 10 15".

Hello I made .bat and .vbs file for this use

mega.nz/

Info:

1. For this to work you need to have DDM installed

2. You need to have 64 bit OS or you need to edit path to program

3. Put folder Monitor with files on root of disk C

4. To increase brightness double click "Increase_brightness.vbs"

5. To decrease brightness double click "decrease_brightness.vbs"

You can run .vbs with some program for shortcut for example I Use Razer Synapse.

Good luck