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Reduce brightness level below Minimum!

August 13, 2013

Long time since last post 😐

Guys! I came across this problem the other day. What if you wanna use your PC with lights off. OK reducing the brightness to its minimum possible level might sound the easiest solution, and yes, it works for some time, maybe 5-10 minutes. But then you feel you would be comfortable with an even dimmer screen. Can you do it ?

For ubuntu users, yes you can.

Just browse through your systems ‘sys’ folder and look for a ‘backlight’ folder. Once you know how to navigate to the brightness text file, just type in this line in your terminal.

$ sudo nano /sys/class/backlight/intel_backlight/brightness

Then type in your password, and the following text file opens up!


Edit the value in there. I’d suggest, for reading documents in complete dark, a brightness value of 30 to 50 would be comfortable.

1. “ctrl + x” for exit
2. “y” to select yes
3.  press enter and see the change for yourself

The brightness test file might not be in the same location as above. Try searching for it.



From → Linux

  1. Pinaki Kumar permalink

    A quicker & safer way & system independent way would be to fetch the display device using this:-

    xrandr -q | grep ” connected” [ type in terminal]

    The output will be something like :-

    DVI-0 connected 1680×1050+0+0 (normal left inverted right x axis y axis) 331mm x 207mm

    //Here DVI-0 is my display device

    Now set brightness using this:-

    xrandr –output DVI-0 –brightness 0.5
    [optimum night reading is about 0.3-0.4, dont set it below 0.2, you wont see a thing ]

    To reset, just type in

    xrandr –output DVI-0 –brightness 1.0

  2. yes this works perfect! kudos!

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