Mostly, this issues is traced down to the display driver you are currently using.
Can’t Adjust Screen Brightness in windows 10 Issue (Solution)
Firstly, we have to open Device manager
In Window 10, right-click on the start button and select Device Manager from the list.
Now, Look up for the Display Adapters in the list. Click on it to expand it, right click on the relevant drivers. Select the Update Driver Software from the menu to solve the ‘Can’t adjust screen brightness in Windows 10’ issue.
Select the first option shown in the ‘How do you want to search for the driver software’ dialog box.
I assumed that you are already connected to the internet and you have enough power.
Consequently, your PC will start to download the drivers that are necessary for proper performance.
As a result, you will notice the driver being install automatically.
A message that Windows has successfully updated your driver software along with the details of the hardware will be shown to you.
However, if the Windows 10 brightness adjustment issue still persists. It means that your graphics card manufacturer has not provided any update. Now, you need to continue with the next procedure.
Open Device Manager using the above step given and updating the display drivers.
From the How do you want to search for driver dialogue box, select “Browse my computer for driver software” .
Select Let me pick from a list of device drivers on my computer.
Tick ‘Show compatible hardware’ option from the the dialog box that will appear.
And, select Microsoft Basic Display Adapter and
Finally, click on Next to proceed to solve the ‘Can’t Adjust Screen Brightness in windows 10 Issue’
At this moment, your PC will install the selected driver and your Windows 10 brightness adjustment issue will be solved.
Now, you can check it by increasing and decreasing the brightness of your PC.
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