Can't disable auto screen dimming on ASUS laptop Windows 10
Below are three methods which are supposed to disable Adaptive Brightness. Only one is theoretically required, but I list all three in the order of their likelihood of working out.
Use the Intel Control Panel to set the
Intel HD Graphics
for the power source On battery so as to disable
Display Power Saving Technology :
You may also in PC Settings, System, Display,
turn the Change brightness automatically when lighting changes to Off.
This option should be available if your computer has a light sensor. If it is missing, check the manufacture's website for the correct driver and/or software package, if Windows 10 support is provided for your computer.
Edit also the group policy
Computer Configuration > Administrative Templates > System > Power Management > Energy Saver Settings and set both policies to Enabled at 0%.
For Windows editions of Starter, Home and Home Premium which do not include
the group policy editor, see the post :
Windows Starter Edition, Home and Home Premium do not include gpedit, how do I install it?.