Screen Dim not functioning with 3.16

[Dagger969]

My screen has always been a little jacked up. After the initial 30 seconds or so, it would just turn off instead of dimming. After I loaded 3.16, the screen dim worked for a while. Now, my phone stays fully lit until it goes into standby. It doesn't dim at all. Is there a regedit I can do to fix this or possible something I have overlooked in the settings. I have not played with the settings at all when this started acting up, so I don't think I am responsible.

As always, thanks for the help.