Comment 2 for bug 1474173

This was me listing the same bug with verbose alsa output, instead, before I realized it was pulseaudio. I ended up reinstalling at the time because I got an SSD. I had gotten the same problem after installing skype and going through the same solution, but at the time I didn't realize that skype was the cause. It was marked as answered, but it never was. (I went through that trouble shooting step this time, and it did not fix my issue):

https://answers.launchpad.net/ubuntu/+source/alsa-driver/+question/268878