If Mictorsoft driver- brightness option NOT available,
if Intel driver - brightness option available, but problems with CONTRAST.
Anyway laptop should work with Intel driver normal, that's for what I paid money..
This message was posted on behalf of Intel Corporation
Could you please let us know the driver version you are running? Please go to Device Manger> Display adapters> Intel(R) HD Graphics right click on Properties and then go to Driver, you will be able to see the version installed.
As mentioned before, you should be able to change the brightness from the operating system. What is the Windows® 10 build version you have installed?