How to set xrandr screen brightness to run on startup?

Question

I use this command everytime I login because the screen is just too bright.

xrandr --output HDMI-A-0 --brightness 0.90

How can I make this command run on startup? I use Kubuntu 19.10.

Thanks.

Does this answer your question? How to run xrandr commands at startup in Ubuntu (relevant comment if you use the first answer) — muru, Mar 24 '20 at 09:50

score 1 · Answer 1 · answered Mar 24 '20 at 10:12

you should create a file named rc.local in /etc folder and give it executable permissions...

sudo nano /etc/rc.local

file needs to be look like this

#!/bin/bash
xrandr --output HDMI-A-0 --brightness 0.90

use Ctrl+x to save and exit click Y Enter to confirm ...

Note:

xrandr --output HDMI-A-0 --brightness 0.90 --gamma 1.05:1.00:0.95

also works to adjust color using R:G:B channels and a little bit sharpness when you combine with --gamma I think ...

for better contrast I use this :

xrandr --output DVI-D-0 --brightness 1.1 --gamma 0.9:0.9:0.9

for more cold colors :

xrandr --output HDMI-A-0 --brightness 1.1 --gamma 0.85:0.85:0.9

1 Answers1