Double check your settings:

http://ubuntuforums.org/showpost.php?s=302d94da79a13b033809169eb9ad2836&p=3584794&postcount=6

[quote]OK I fixed it... this one is a fun one.
In power preferences, in AC options the slider is for "Set display brightness" 
and it's on 100%. The slider for Battery options however is for "Dim display 
by", which seems backwards... I don't understand why they both wouldn't be 
brightness sliders, but oh well.[/quote]

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screen goes blank and the power manager is not configured to do that
https://bugs.launchpad.net/bugs/160628
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