I've never seen anything like this. Did a fresh install of x64 Nadia with Cinnamon. Everything was working fine, including sound. Was a little quiet, though, so I went to the volume icon in the tray and turned it up. Immediately, the sound went choppy, and to my surprise, the volume icon started flickering in time with it! Happens 1-2 times a second. I pulled up the audio options from the icon, and discovered that the whole audio gui seems to be doing this: the 'on/off' switch is toggling back and forth, the volume bar is jumping from 0% to whatever I set it to, multiple times a second. The problem persists after several reboots. Through my interaction with the gui sound interface, I seem to have triggered this erratic behavior - makes me wonder if it's a Cinnamon issue.
Kernel: 3.5.0-17-generic x86_64
Mobo: ASRock model: 870 Extreme3
Graphics: Card: NVIDIA G92 [GeForce 9800 GT] X.Org: 1.13.0 drivers: (unloaded: fbdev,vesa)
Audio: Card: Advanced Micro Devices [AMD] nee ATI SBx00 Azalia (Intel HDA) driver: snd_hda_intel Sound: ALSA ver: 1.0.25
Thanks for any input.