My laptop, Acer Aspire 5740, running Ubuntu 16.04 and Windows 10 as dual boot. On Windows I can change the display brightness so that it changes instantly, but when I boot into Ubuntu and change the display brightness, it doesn't change the brightness until I reboot. What may be the reason for this? How to fix it?
31 Answer
try this to increase and decrease screen brightness
xrandr --current # to get the name of the your laptop's active display
xrandr --output LVDS1 --brightness 1.0 # change from 0.0 to 1.0
