auto brightness headache

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http://forum.xda-developers.com – I can not for the life of me figure out why they would take the auto screen brightness option out of this phone. There is an app for older xperia phones that lets you turn it off, it doesn't work on our ion. I've tried a few other screen control apps but none could turn off the auto brightness. It wouldn't bother me so much, except the transition is so jumpy in certain lighting situations. It looks like the screen is flickering. I even emailed Sony support. About it. I wonder what there response will be. Does anyone here have any idea of how to turn it off, or fix the backlight transition s (HowTos)