my sound was working fine. update manager installed some updates, i only noticed the mesa one. after my next reboot, sound devices were gone from alsa.
Audio: Card-1: NVIDIA GF104 High Definition Audio Controller driver: snd_hda_intel bus-ID: 01:00.1
Card-2: Intel 5 Series/3400 Series Chipset High Definition Audio driver: snd_hda_intel bus-ID: 00:1b.0
Card-3: Microsoft LifeCam Cinema driver: USB Audio usb-ID: 045e:075d
Card-5: Plantronics GameCom 777 5.1 Headset driver: USB Audio usb-ID: 047f:ad01
Sound: Advanced Linux Sound Architecture ver: k3.13.0-24-generic
sudo echo 'options snd-hda-intel model=auto' >> /etc/modprobe.d/alsa-base.conf
about to reboot now. I've had this happen once before, i believe i went and custom compiled the latest kernel.org kernel and got my sound back.