You should see an Intel Graphics icon in the system tray on the lower-right of the taskbar. Click on that and you'll be able to access the various adjustment settings for that particular video adapter.
''Laptop display. Laptop displays don't have brightness or contrast buttons on the front. For a majority of laptops, there isn't a control for setting the contrast. However, you can set the brightness of many laptops by pressing and holding the Fn key, and then pressing a function key to decrease brightness () or increase brightness (). When using Display Color Calibration on a laptop, set the display to the maximum brightness setting.''
I tried this but it didn't work and there is no Intel Graphics icon on my taskbar.