Yosemite TDM   f1/f2 do not function

Yosemite TDM   f1/f2 do not function
I use Imac 27  end 2009 as screen of a macmini 2012 (with TDM target display mode)
the 2 macs are connected by a cable mini display port.
Since yosemite with Command/f2 I switch the screen towards the macmini but the luminosity is at the max .
I do not have the possibility of regulating the luminosity with f1 or f2 as in maverick.
So I can't use TDM any more (my eyes ...)
Thank's for your help
Roland

Hey Thunderlight, Sorry to hear about your problem, I ran into a similar problem with my wife's 15" mbp. The screen was completely off but we couldn't increase the brightness because pushing the f2 key just made "Bonk" noises without bringing up the brightness bar.
Go to "System Preferences" and open "Keyboard & Mouse", make sure the box for "Use all F1, F2, et. keys as ....." is NOT checked. That solved our problem. If it is checked the F1, F2 keys don't do anything unless they are set up to work in an application. Hope that helps!

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