Reduce laptop screen brightness below minimum in Ubuntu 13.10

Question

My laptop configuration is Dell Inspiron 1440. I want to reduce my laptop screen brightness in Ubuntu below the minimum level that can be set using system settings. I usually set my screen brightness to an ultra low level, as it hurts my eyes.

I have already searched for the solution online and found related posts:

• Can I fine-tune my screen brightness?

• Dim screen past the minimum on Ubuntu – I have already tried the solution mentioned in that article.

• Decrease Backlight Below Minimum

The problem is that in my case the screen brightness value in the file /sys/class/backlight/acpi_video0/brightness is already 0.

I have tried installing backlight and setting it to 0, and overwriting the value again as described in one of the posts above. However, none of it helps. I am currently using the latest version of Ubuntu 13.10. Thanks,

Answer 1

Reduce the brightness by changing the value in the following file:

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

Set the value to 0 for absolute low brightness.

Answer 2

You can try "f.lux". With it, you can change how the colors are displayed on your screen and maybe your eyes like the new way. That program will try to simulate a low light level ambient in your screen.

http://justgetflux.com/