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I have an iPhone 5 and my auto brightness turns off whenever I use the slider to reboot. However, even when I turn auto brightness on it doesn't seem to be working. My brightness always stays the same whether I'm in a dark room or holding my phone under a lamp.
 
on my 5S, pulling up the slide to turn off screen and canceling doesnt effect it. however, performing an actual reboot does indeed turn it off upon reboot. also, i need to manually turn the brightness down on reboot too as turning it on and toggling the screen lock doesnt register right away.
 
I have an iPhone 5 and my auto brightness turns off whenever I use the slider to reboot. However, even when I turn auto brightness on it doesn't seem to be working. My brightness always stays the same whether I'm in a dark room or holding my phone under a lamp.

Calibrate it and it may start working again. I gave up on auto-brightness years ago and to my surprise it actually works.
 
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