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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 :)

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  • What graphics and driver are you using? Please add the output of lspci -v.
    – Wilf
    Jun 30, 2014 at 17:32
  • 2
    SOLVED ! I installed xbacklight and it works perfectly
    – user299004
    Jun 30, 2014 at 18:17
  • 1
    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.
    – Wilf
    Jun 30, 2014 at 18:22
  • 1
    here is oneliner sudo apt-get install -y xbacklight && xbacklight -set 30
    – Dimitry K
    Jan 27, 2015 at 22:00
  • Why is there always someone asking some complicated and often irrelevant question? Though this one is nice, at least he says how to obtain the answer. Often it's more like "What is your ekltcnelcti?"
    – Alain Reve
    Feb 15 at 5:53

7 Answers 7

Reset to default
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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

enter image description here

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

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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
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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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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
  1. Change the brightness level for the connected monitor.

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

Linux distro: Pop!_OS 20.04 LTS

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  • This worked for me as well!
    – Jay Lee
    Dec 27, 2021 at 15:33
0

I found the Indicator Brightness quite useful.

https://launchpad.net/~indicator-brightness/+archive/ppa

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Please have a look here:

StackOverview

bl_device=/sys/class/backlight/acpi_video0/brightness
echo $(($(cat $bl_device)+1)) | sudo tee $bl_device # brightness up

bl_device=/sys/class/backlight/acpi_video0/brightness 
echo $(($(cat $bl_device)-1)) | sudo tee $bl_device # brightness down

bl_device=/sys/class/backlight/acpi_video0/brightness
echo 5 | sudo tee $bl_device # given value

cat /sys/class/backlight/acpi_video0/brightness # get value

Very smart and simple solution at that page.

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  • 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/
    – nilesh_101
    Nov 28, 2020 at 13:50
  • That is for Arch Linux
    – Alain Reve
    Feb 15 at 6:03
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In the terminal, you can type: xgamma -gamma 0.6

The default value is 1. Anything higher than 1, for example 1.2, makes the screen brighter.

The fact that it's a command-line control means you can make it persistent (when you reboot this command is run automatically).

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