How to lower the brightness of my iMac, when used as external display for my MacBook Pro?

The keyboard brightness controlls of the iMac do not work. The keyboard brightness controlls of the MacBook only controll the MacBook. Same goes for the display set up of the MacBook, I can change the MacBooks brightness there but not the one of the secondary screen.
I am working in a pretty dark room and that iMac 27 is at full bightness. Gives me a headache. Please help.
Thanks

Right, it shoulld work if Mid 2011 & up, might it be a bad TB cable?
Here's how it's supposed to work...
http://support.apple.com/kb/HT3924
The mid 2011s & up need Thunderbolt...
http://support.apple.com/kb/TS3775

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