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I have installed xbacklight and am getting 'No outputs have backlight property' on executing

xbacklight -set 50 OR

xbacklight +10

My system directory: /sys/class/backlight is empty

I have seen some solutions for the same but am unable to change brightness from terminal.

This is the result of xrandr -q --verbose

Screen 0: minimum 16 x 16, current 1920 x 975, maximum 32767 x 32767
XWAYLAND0 connected 1920x975+0+0 (0x51a) normal (normal left inverted right x axis y axis) 0mm x 0mm

Identifier: 0x21
Timestamp:  17063948
Subpixel:   unknown
Gamma:      1.1:1.1:1.1
Brightness: 26.
Clones:    
CRTC:       0
CRTCs:      0
Transform:  1.000000 0.000000 0.000000
            0.000000 1.000000 0.000000
            0.000000 0.000000 1.000000
           filter: 
non-desktop: 0 
    supported: 0, 1



1920x975 (0x51a) 155.250MHz -HSync +VSync *current +preferred
        h: width  1920 start 2040 end 2240 total 2560 skew    0 clock  60.64KHz
        v: height  975 start  978 end  988 total 1012           clock  59.93Hz

please help me

sancho.s ReinstateMonicaCellio
  • 15,307
Jay B
  • 23

1 Answers1

2

Use

xrandr -q

to learn the name of your display. Then

xrandr --output <display name> --brightness <level>

Note: for a finer control (albeit via GUI, I am not sure it has a CLI), you can use brighness-controller

sudo add-apt-repository ppa:apandada1/brightness-controller
sudo apt-get update
sudo apt-get install brightness-controller

Related:

  1. Ubuntu 20.04 brightness adjust not working
sancho.s ReinstateMonicaCellio
  • 15,307