This is a Quest App that sets the Screen-Brightness to 0 and keeps it there. It's running as a background-service and sets it back to 0 every 60 seconds (if e.g. the System sets it to 100).
To get it running:
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install the apk (e.g. via SideQuest)
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go to "Unknown Sources"
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Start "com.benjy3gg.endlessbrightness"
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Allow the Permissions in the Popup for Changing System Settings (needed for setting the Display Brightness)
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In the App choose either "Brightness 0" or select the brightness with the slider.
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Press the "Save" Button and your new brightness setting will be saved.
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Done, the app will set the brightness to 0 every 60 seconds
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If you want to stop the service, just start the app again and choose Set Brightness Auto which will stop the service