Brightness can be set to 0 making the screen black

Using the brightness slider in the top drawer, brightness can be set to 0. When that happens, the screen turns to black and you can't see anything anymore. You either have to guess where the slider is or get a SSH or serial access and manually set the brightness.

Since there is no use in having the brightness be any less than 1, this should be the minimum value the slider can set it too.