outdoor light screen always on

sorry, now I've tried everything but in no forum you can figure out where does the problem of the difficulty of the automatic brightness of this phone . in short, if someone has turned on the network more than I could tell if it's a hardware or software problem ? It could be solved by future upgrades or we have to get used to this problem ?
what gained me the most is the impossibility to use dell'always on outdoors ! Incredible !