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This is not duplicate of . I have already tried the solution mentioned in the above article. my laptop configuration is dell inspiron 1440. I wanted to reduce my laptop screeen 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

Decrease Backlight Below Minimum

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 . Any help is highly appreciated. Thanks,

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I don't know if that's possible, but what I use is an app called RedShift, which gives the screen a redshit and is much easier on the eyes. If you do give it a try, don't kick it immediately. It takes a while to get used to. – Jeremy Jan 3 '14 at 3:01
you can also try flux and I'd also play with the contrast as well. – virtualxtc Jan 3 '14 at 10:50
@Jeremy Redshift adjusts the picture (contrast) before it's being output to the screen. This reduces contrast and is not the proper way to reduce the brightness (amount of light). – gertvdijk Jan 3 '14 at 10:50
Not all displays allow lower brightness settings. Perhaps it's just not possible for your model to reduce it further. – gertvdijk Jan 3 '14 at 10:51

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