Brightness slider suddenly gone?

[drewfuss99]

I was just going about my business the other day, checking social media and whatnot, when I pulled my notification bar down to decrease my screen brightness. Discovering the slider to be gone, I went straight to my notification panel settings menu, and toggled the brightness slider off then on again (it was still set to on when I accessed the menu). I checked again, but the slider was still nonexistent. Confused, I restarted my phone, but the slider was still gone. I have went back several times to toggle the setting on and off, but the result is still the same.

Any suggestion would be much appreciated.

 

[Rukbat]

Velis Auto Brightness. It works a lot better than the native automatic mode. (The screen still won't win awards for readability with the sun shining directly on it.)