Hello Everyone,
I don't know if this has been resolved yet but here I go. Ive had a perfectly running Mavericks install on my D830 for a long time now and I decided to try Yosemite. AFTER MUCH TRIAL AND ERROR I've finally got it installed and I commend you Herve and everyone else for all the hard work. Thank you.
Ive searched high and low for Kext or solutions to these problems and still no joy. My Yosemite install just won't cooperate with none of the solutions applied. Please help, still no sound or working iMessage.