Volume Keys not working with HDMI audio on mac OSX Lion? I have a mac mini 2011 with OSX Lion. And I have connected my monitor (with integrated speakers) through hdmi port. The sound is working fine, but the volume keys on the keyboard don't work. 
When I press one of them the volume image appears on the screen but with a prohibited signal.

Is there a way to fix this and make my keyboard keys change the system volume?

By the way, they work very well when I use another audio output device
See a solution here for the problem - http://www.vanetta.net/2012/07/enabling-hdmi-audio-controls-on-2011.html

Requires the free third party app - https://code.google.com/p/soundflower/ but it works perfectly.