If you're still having problems and you can verify that the problem also persists when you have killed pulse (hence experiencing the problem also with pure alsa), head over and have a look at the bug I created for that case on alsa-driver: https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/479375
If you're still having problems and you can verify that the problem also persists when you have killed pulse (hence experiencing the problem also with pure alsa), head over and have a look at the bug I created for that case on alsa-driver: https:/ /bugs.launchpad .net/ubuntu/ +source/ alsa-driver/ +bug/479375