Help Screen brightens and dims intermittently

I've looked around at few threads and my particular hasn't seem to come up.

Loving the phone, the auto-dim works great when i pull the phone closer or away from my face. My issue is when I'm playing a rom on my phone for an extended period of time (maybe 15 minutes), I notice that the screen either gets brighter for a few moments, or will get dimmer. The seems to happen without any warning or prompting... maybe it occurs because i accidently hit the home button, then return to the rom and once the phone knows i'm just playing the rom it dims to conserve battery?

and when i say dim, i mean doesn't turn black or anything

I've been very curious about this...please let me know what you think or direct me to a post


Android Expert
It's because you have it set to auto-brightness. It detected a slight change in light levels and adjusted. Mine will do that depending on the lighting behind me.