My LUbuntu 18.04's lxpanel is not working. Which command can I run to adjust brightness of my screen? Thanks.
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First, run xrandr | grep " connected" | cut -f1 -d " " to get your screen name.
Once you got your screen name, run xrandr --output <screen_name> --brightness <brightness_value>, the brightness value is between 0 and 1.
CREDIT: How To Control Your Monitor Brightness From Command Line In Ubuntu?
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1A good answer, this did the trick for me. – Ollie May 20 '20 at 12:46