Hi my name is ***** ***** I will be the expert working with you today to help resolve your problem.
you will have to update your display driver to make the brightness control work again.
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remote access will give a direct access to work on the problem rather then a phone call. do you have skype installed on your computer.
what is the name of the driver?
are you adjusting the brightness control from your keyboard?
how do you adjust the brightness control?
you will see Fn key at the bottom left hand of your keyboard press that and then tap on the F6 and F7 to adjust the brightness let me know if that works.
please click on the battery icon on bottom right of taskbar...click on more power options....you will be able to see the option to change the brightness setting
you can adjust the brightness by sliding the marker for both adapter andbattery mode
click on save changes
let me know the status
so do those keys adjust the brghtness
also did you try the power options setting i gave above
so does it make the change to the brightness..the f11 and f12 key
or there is no change
click on the battery icon on bottom right
click on power options
let me know if its set at balanced or power saver
click on chnage plan settings
slide it and click save changes
once you save the changes brightness should change
so if you increase the brightness, does the brightness reduce on its own or stays at that same ratio
i have checked with the windows 8.1 version settings
the recommended way to adjust brightness is via the function keys that is f11 and f12
if these keys are able to adjust the brightness there is nothing you should worry about
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