How to adjust brightness on Lubuntu?

Question

I can't adjust my screen brightness. Indeed, I can't find this option in my system parameters. I am using Lubuntu 12.04. Thank you for your time :)

Solution 1

This one worked for me, hope it might help someone. Brightness is the default tool to control your screen brightness.
How to Launch
To launch Brightness from the menu Preferences ‣ LXQt settings ‣ Brightness. Another way is to press the Brightness icon on LXQt Configuration Center or run below command on terminal.

lxqt-config-brightness

However lxqt-config was not installed in my case already. So I did install it first with below command and then just executed above command to launch brightness tool.

sudo apt install lxqt-config

More details you can refer here https://manual.lubuntu.me/stable/3/3.2/3.2.3/brightness.html

Solution 2

You can solve your problem by using xbacklight which uses the RandR extension. Install it using:

sudo apt-get install -y xbacklight

Use it:

xbacklight -set 45

Solution 3

Installing xbacklight did not do the trick for me.

I then used the already available xrandr utility as follows:

1. Find the connected monitor name.

$ xrandr | grep " connected" | cut -f1 -d " "
HDMI-0

2. Change the brightness level for the connected monitor.

$ xrandr --output HDMI-0 --brightness 0.75

Linux distro: Pop!_OS 20.04 LTS

Solution 4

I am not a pro, I am only posting what worked for me

Go to taskbar, right click on the battery icon, there's option for brightness.

or

sudo apt-get install brightness-controller

but the brightness goes back to full if charger is plugged in/out or if you reboot your machine, that means you have to do it again and again.

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Comments

[Wilf]

What graphics and driver are you using? Please add the output of lspci -v.

[user299004]

SOLVED ! I installed xbacklight and it works perfectly

[Wilf]

If you solved the problem, add it as your own answer (with a short method of how you did it) below and mark it as answered so the question can be closed.

[Dimitry K]

here is oneliner sudo apt-get install -y xbacklight && xbacklight -set 30

[nilesh_101]

Thanks @xerostomus, this solution worked for me. Just one correction in my case it is intel_backlight instead acpi_video0. So for others before executing above command just check whats there inside backlight folder using ls /sys/class/backlight/

[Jay Lee]

This worked for me as well!