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Tags: 18.04   gnome   brightness   backlight  
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Title: Ubuntu 18.04 brightness/backlight command
ID: /2019/07/05/Ubuntu-18.04-brightness_backlight-command
Created: July 5, 2019    Edited:  July 5, 2019
Upload: November 24, 2022    Layout:  post
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You can use these commands in most if not all versions of gnome:

# Increase brightness:
gdbus call --session --dest org.gnome.SettingsDaemon.Power --object-path /org/gnome/SettingsDaemon/Power --method org.gnome.SettingsDaemon.Power.Screen.StepUp

# Decrease brightness:
gdbus call --session --dest org.gnome.SettingsDaemon.Power --object-path /org/gnome/SettingsDaemon/Power --method org.gnome.SettingsDaemon.Power.Screen.StepDown

If you have multiple monitors, you may be interested in this script which dims up to three monitors after 5 minutes of inactivity until mouse is moved or key is pressed. This is convenient when watching a movie on a second to fourth monitor (ie Big Screen TV).

At the very least the script will help you learn xrandr in general and how to change brightness using xrandr in great detail.

⇧ Run Bash scripts in folder all at the same time Keyboard repeat/delay is reset occasionally in Ubuntu 18.04  ⇩