I can also confirm this bug and it is kernel related: Everything is working fine on the default 12.04 kernel (3.2), but once you upgrade to the trusty-backport kernel (3.14), this problem occurs.
I can also confirm this bug and it is kernel related: Everything is working fine on the default 12.04 kernel (3.2), but once you upgrade to the trusty-backport kernel (3.14), this problem occurs.