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Brightness control from USB

I have no idea! :) However, if you give us a little info, someone will probably be able to help.

What manufacturer and model tablet is it? Which Android version is it running? Is it rooted?
 
It is not actually tablet pc.It is device which has android OS it has android 6.0 version and it is rooted.When I open the radıo on the car I want to increase the brıghtness when I turned off I want to decrease the brıghtness I can use USB port and I2C port but I dont know how to do it
 
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