As mentioned on the link in my comment #34, it seems like my problem was related to this bug:
https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/617647
As mentioned on the link in my comment #34, it seems like my problem was related to this bug:
https:/ /bugs.launchpad .net/ubuntu/ +source/ alsa-driver/ +bug/617647