Adjusted minimum brightness, got black screen often now, why?

[norweger]

Lying in bed it's nice to have dim lights, so I wanted to adjust the brightness of the display below stock minimum, and found a guide which said:

Go into: sys/class/leds/lcd-backlight
In that folder open «brightness» as a text file, and change the value from «10» to «1».

The only problem was my phone already had the value set to «1», so I thought, let's set it lower, let's set it to «0.5», so I did. And not long after the phone got a black screen, and I held all buttons to boot, and when it was rebooted everything worked fine, just fine. Except that I now, once in a while, get a black screen.

I'd love to get help to fix that. If you have any ideas, please let me know!

To troubleshoot, I used ES File Explorer again, and opened the said «brightness» file and I saw that it's been automatically (I suppose) set back to «1».

But I have this folder called:
sys/class/leds/lcd-backlight-nits
And in that folder the «brightness» is set to «0» (not 0.5)
Not sure if that "nits" folder is new, or autogenerated or related to the problem.

 

[ocnbrze]

why not just you use the brightness feature from the pull down notification bar? is your phone rooted? what phone do you have?

 

[norweger]

It is rooted with CM13, a HTC M8, and the issue is that I can't go below the minimum on the pull down notification bar. Manufacturers have set a minimum higher than the real minimum, so it's very nice to go below that when in bed with someone else, and besides I think it feels better for the eyes with less light.

So there's a workaround to edit that brightness file in /sys/