My dad's old Sanyo from early 90's did have brightness control buttons. https://github.com/JPersson77/LGTVCompanion https://github.com/JPersson77/LGTVCompanion

My dad's old Sanyo from early 90's did have brightness control buttons. https://github.com/JPersson77/LGTVCompanion https://github.com/JPersson77/LGTVCompanion I have a few extra buttons on my gayming keyboard that I pretty much never use, so I assigned three of them to a script that uses the above app to change brightness between 30/50/100.