Upgrading to Ubuntu 14.04 fixed the issue for me. :-)
Sound is available, without the need to manually apply the workaround or changing configurations, etc.
So you should consider upgrading to Ubuntu 14.04.
But now I am still fighting with the proprietary NVIDIA graphics card driver in 14.04 (See #1313274, if you have an NVIDIA card) :-(
Upgrading to Ubuntu 14.04 fixed the issue for me. :-)
Sound is available, without the need to manually apply the workaround or changing configurations, etc.
So you should consider upgrading to Ubuntu 14.04.
But now I am still fighting with the proprietary NVIDIA graphics card driver in 14.04 (See #1313274, if you have an NVIDIA card) :-(