Dell XPS 13 Display Settings

I am trying to change the video settings such as brightness and contrast of my Intel HD Graphics 4400. When I save the settings nothing happens.

For example when I increase the brightness from 30 to 70, the small preview picture changes the colour, but when I save the settings and close the Graphics control panel, the colour remains the same as it was in its default setting.

I updated the driver but the same problem persists.

Any ideas?

Thanks