Doesn't work on Fairphone 2 (Android 5.1, Lollipop)
The Fairphone is rooted by default. Nevertheless when I install the f.lux App from the Google Play Store every time the App starts, it says "f.lux was unable to get root access." and restarts again and again, until I force to shut it.
@Sebastián-Huter You may need to check the root method somehow. Maybe download "Super SU" or something of that nature to control the permissions that apps can receive, and allow f.lux!
Thanks for the hint. Using the superuser app I also checked the root status and found out, that the Fairphone 2 (unlike the Fairphone 1) is not rooted by default. Thats probably the problem