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Fedora 22 - minimal screen brightness still too bright


Is there a way to set the screen brightness below the minimum ? I am asking this question for an old laptop from 2009, a Dell Precision M4400. It has the nvidia Quadro FX 770M graphics card, and I am using the nouveau driver. The problem is that the screen is still too bright even when the brightness slider in GNOME is completely on the left, and it hurts my eyes. I don't know if the screen can really not use a lower brightness than that, or if it is a software problem. (I have another newer laptop whose minimal brightness is much lower on Fedora.)

I had a look at /sys/class/backlight/acpi_video0, and I got this :

[root@dpm4400 acpi_video0]# cat brightness 
[root@dpm4400 acpi_video0]# cat actual_brightness 
[root@dpm4400 acpi_video0]# cat max_brightness

Can I try to set a value lower than 1 ? A negative value ? I did not dare do this, as I thought it might crash.

I also tried the xbacklight command, but it seems to have no effect at all.

Or is there an application I could use to dim the screen ? Thanks