Auto-brightness problem, anyone experience it ?

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http://forum.xda-developers.com – Hi, I have an auto-brightness issue, when I turn the auto mod on the screen turn all black. I can still heard clicking sounds and when I put the N7 under a strong light ( white leds ) it turn on. So it is definitely a brightness problem. I just fix the level on 25% and everything go right, until I start the YouTube app who magically change the brightness and in the first 5sec of the video the screen turn black again I have to fix the value at 50% for avoiding that. Anyone experience this issue ? Any fixe ? Do you think it's an ardware or software problem? Thanks (HowTos)