Anonymous
Painful to try and do this in terminal via xrandr. BUT, found script somebody came up with on this post: http://askubuntu.com/questions/1150339/increment-brightness-by-value-using-xrandr
Created it, made executable and cd to the file and then “./bright Up” or “./bright Down” and it works. This is simple and it works!!! You need to know xrandr name for your monitor (my monitor is VGA-1) and you can set increment to whatever you want.
There is a gui front end for xrandr called arandr, and I tried installing it, but guess what, its already installed, but AntiX doesnt have some files to use its built in display, I assume this is what Screenlight is trying to substitute for without those extra files.
Honest I like that script posted in link above. Its a way to make brightness adjustible EASILY from commandline. And since there are no values to enter, you could just make couple shortcut scripts on desktop, one for brightness up and other for brightness down. Then wouldnt have to use a terminal.