[Q] [Help] Can't change brightness from build.prop

I have a mt6572 phone and I'm facing a problem related to brightness of my phone.
My screen brightness is always high and it burns my eyes at night.
I cant find any brightness option in my build.prop.
So I added this line to appropriate section of build.prop--

Code:

---

ro.lcd.min_brightness=blah(low as possible)

---

I rebooted my phone and nothing changed.
Still high brightness.

So,I tried this--

Code:

---

ro.init.screen_brightness=blah(as low as possible)

---

It didn't make any difference too.
I tried changing roms.
But every kk rom has the same issue(But ported from different phones).
It dont happen in LP roms.

I know about CF lumen,Darker and etc. screen controller app.I know those are great but I don't wanna use them.
I just want to get rid of it without using an app.

I will be glad if someone post a solution for me.
Regards

BatDroid

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