I really know nothing about this because I haven't run across a problem. However I am running KDE and in system settings, phonon, audio hardware setup there is a selection for connector, either analog output or headphones. If I select headphones my speakers do nothing. Does Cinnamon have a 'connector' option?
i5 3570k, ASRock z77 Extreme 4, 8 Gb Ripjaws 1600, Antec 430w psu, HVR 1600 tv tuner, custom case- marble top, oak face. Carver & DCM Time Window sound system. Mint 14 KDE.