The fix mentioned in comment #9 is now also available in the upstream 3.12.7 kernel.
A PPA of this kernel is available at http://kernel.ubuntu.com/~kernel-ppa/mainline/ and instructions on how to install and uninstall it are available at https://wiki.ubuntu.com/Kernel/MainlineBuilds
The fix mentioned in comment #9 is now also available in the upstream 3.12.7 kernel.
A PPA of this kernel is available at http:// kernel. ubuntu. com/~kernel- ppa/mainline/ and instructions on how to install and uninstall it are available at https:/ /wiki.ubuntu. com/Kernel/ MainlineBuilds