[Q] missing dock settings on lollipop topic

So, the lag is annoying but since lollipop I can't get sound from the official dock.
Only from the nexus 7 speaker, seems to charge and recognise it's on a dock but there only reason for the dock is the line out...
There used to be some settings in the sound menu for this but there is nothing there any longer - can anyone help?
Seriously regretting this update might just root and get something usable on it!