I already reported this problem in Launchpad and they sent me here. https://bugs.launchpad.net/ubuntu/+source/linux/+bug/973160 "This issue appears to be an upstream bug, since you tested the latest upstream kernel. Would it be possible for you to open an upstream bug report at bugzilla.kernel.org [1]? That will allow the upstream Developers to examine the issue, and may provide a quicker resolution to the bug. If you are comfortable with opening a bug upstream, It would be great if you can report back the upstream bug number in this bug report. That will allow us to link this bug to the upstream report. [1] https://wiki.ubuntu.com/Bugs/Upstream/kernel"
Does the problem exist with the latest kernel 3.12? If so, please give alsa-info.sh output. Run it with --no-upload option, and attach to the bugzilla (don't paste). At best, take alsa-info.sh outputs on both working and non-working kernels.