You are right. And unfortunately F/N + F1 doesn't work at all on an iMac since 
10.7.3. For me that's absolutely annoying because I'm light sensitive but can't 
do anything with the screen. Right now - and please don't laugh - I put a 
T-Shirt over the screen of my iMac. . 
All the best
Jürgen

Am 24.03.2012 um 23:55 schrieb Ricardo Walker:

> Hi,
> 
> until the bug is fixed, you can press FN + F1 to turn down the screen 
> brightness and FN + F2 to turn it back up.  Note: if using a Macbook, turning 
> brightness to 0%, will turn off the screen.  No one will be able to see 
> anything.  This is not the case with iMacs and Mac minis.
> 
> hth
> 
> Ricardo Walker
> rica...@appletothecore.info
> Twitter:@apple2thecore
> www.appletothecore.info
> 
> On Mar 24, 2012, at 1:54 PM, Traci <our4p...@gmail.com> wrote:
> 
>> Hi all,
>> 
>> I have a bit of vision and I like to use screen curtain from time to time.  
>> I always thought screen curtain turned the screen dark.  Are there options 
>> here?
>> 
>> Just recently, I hit screen curtain, and my screen looks white, not dark.  
>> Does anyone know anything about this?  A bug maybe?
>> 
>> Thanks,
>> Traci
>> 
>> Sent by Macbook Air Mail
>> 
>> 
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