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Try turning off Auto-Brightness. I noticed the same thing; and once I turned off Auto-Brightness it seemed to be more of a gradual change (and brighter).
 
I was wearing some Costa del Mar sunglasses today, and when I rotated the iPad to portrait the screen would dim. I turned it landscape, and it would brighten up. I rebooted and the white apple did the same thing. Great, I thought, my iPad broke.

Then I took my sunglasses off... :cool:
 
I was wearing some Costa del Mar sunglasses today, and when I rotated the iPad to portrait the screen would dim. I turned it landscape, and it would brighten up. I rebooted and the white apple did the same thing. Great, I thought, my iPad broke.

Then I took my sunglasses off...

It's called Polarized sunglasses. My BMWs controls do the same thing. Polarization works based on the direction the lens reflects light, so when the iPad screen orientation is in the same orientation as the Polarized sunglasses it causes the screen literally to disappear. Tilt your head in a BMW, you will see the same thing.

BJ
 
It's called Polarized sunglasses. My BMWs controls do the same thing. Polarization works based on the direction the lens reflects light, so when the iPad screen orientation is in the same orientation as the Polarized sunglasses it causes the screen literally to disappear. Tilt your head in a BMW, you will see the same thing.

BJ

New BMWs have corrected this
 
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