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I am an ex-Windows user, I noticed that minimum level of screen brightness on ubuntu is way brighter than minimum level on windows when I was using it on the same hardware. I was wondering if I can set the brightness level on ubuntu at a level even lower than the minimum level it allows, because default minimum brightness on ubuntu is too brighter for me. Is there any tweak with system settings which I can employ to reduce my screen brightness even further than what default system settings allow?

αғsнιη
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segmentationfaulter
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2 Answers2

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Edit the following file -

sudo nano /sys/class/backlight/acpi_video0/brightness

and change the value to a lower value.

For more methods, refer to question:Decrease Backlight Below Minimum.

Community
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Rohith Madhavan
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    thanks man, it did the trick for me, but for those who want to employ this tweak, don't change the value to zero, it will turn the screen off completely, try some bigger value and adjust as per your needs. – segmentationfaulter Dec 20 '14 at 17:20
  • Edited the answer accordingly. – Rohith Madhavan Dec 20 '14 at 17:21
  • can anybody tell me why can't I edit this file using vim editor even using sudo? – segmentationfaulter Dec 21 '14 at 02:10
  • FYI, the path could be different depending on the computer. For me it was /sys/class/backlight/amdgpu_bl0/brightness, so you might need to go to /sys/class/backlight/ and see what folder you have. Also, my lowest default screen brightness was 2, and when I changed it to 1, it was only a little dimmer, and it seems it doesn't take decimals, so I'll keep looking for a way to make it ultra-dim. – Dima Nov 24 '22 at 00:40
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You could try 

acpi_backlight=vendor

as a Kernelparameter. I had such a problem, too. This parameter solved it for me. You can read here for Kernelbootparameters..

0xAffe
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