27" Cinema Display - No Brightness Control

I have read over all the threads here and the internet.  I have an iMac (black back) that my 27" Cinema display is connected to.  USB and Displayport are both connected.  Everything appears just fine.  However, I cannot adjust the brightness on the Cinema display.  I have tried everything.  I even hooked it up to my Macbook Pro early 2011 model.  Still the same issue.  There is no brightness slider.  The slider only appears for the native display only.  Never the Cinema display.  What am I missing?
Running Lion on both machines.

USB cable is connected.  It's not an SMC issue.  I have tried this on 3 iMac's and 1 2011 MacBook Pro.  Same issue on all machines.  Cinema display does NOT have brightness control.  Only the native screen. 
Tried on OSX Lion 10.7 and  Snow Leopard 10.6.  Tried loading the 1.0 Cinema display firmware update.  Won't install on Lion and states it's not require on Snow Leopard 10.6.
Any other suggestions out there?  The display is full brightness it seems and it's annoying as crap.

Similar Messages

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    FINAL NOTES
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    http://support.apple.com/kb/DL1338
    http://support.apple.com/kb/DL1107
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    They require that you make a brand new OS installation to be of any effect and are included in Software Updates.
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    With Best Regards / Christian

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    <http://support.apple.com/kb/HT4293>
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    Okay, I came across a thread that implies there is a problem with using the Apple ADC-to-DVI adapter to attach the older "acrylic" 23" Cinema Display to a Mac Pro DVI graphics card. Basically, the workaround is to NOT use the USB part of the adapter (disconnect it).
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    Michael Byrnes wrote:
    I have a problem I am so far not able to resolve. I have a new 2008 MBP 17" with an Apple Cinema Display hooked up to it. The color on the MBP is nice and seems "right".
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    Here you go
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