Ubuntu – Changing the screen brightness of the external screen

16.04brightnesshdmimultiple-monitors

I have installed Ubuntu 16.04 TS on my laptop and i have connected my laptop to an external monitor via HDMI cable. I can easily change the brightness of the screen of the laptop but that does not affect the brightness of the external monitor. Is there any way to change the brightness of the external monitor as well?

Best Answer

It's very easy to do via the command line. First, type the following command in terminal to identify your screens:

xrandr -q | grep " connected"

and you'll get something like this:

LVDS1 connected 1366x768+0+0 (normal left inverted right x axis y axis) 344mm x 194mm

VGA1 connected primary 1366x768+1366+48 (normal left inverted right x axis y axis) 413mm x 234mm

LVDS1 is related to laptop's built-in display. I am using an external monitor (VGA1 in this case). If you want to reduce the brightness of external screen, you just type this, for example:

xrandr --output VGA1 --brightness 0.63
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