The first thing anyone would need to know is what it was you upgraded this morning. The answer is in /var/log/apt/history.log probably the last entry unless you upgraded more than once today. Post that information here and lets see if anything in there has anything to do with sound.
Fujitsu Lifebook AH532. Intel i5 processor, 6Gb ram, Intel HD3000 graphics, Intel Audio/wifi. Realtek RTL8111/8168B Ethernet.Lubuntu 13.10,Ubuntu12.10 (Unity), Mint16 (Cinnamon), Manjaro (Xfce).