And just confirmed it works with 3.14.0-031400-generic.
So it works with the 3.13 kernel up to 3.13.0-27-generic but is broken in every version I've tested of the 3.13 kernels. It works in both of the 3.14 kernels I've tested, so it looks like it got broken somewhere between 3.13.0-27-generic and 3.13.0-29-generic.
And just confirmed it works with 3.14.0- 031400- generic.
So it works with the 3.13 kernel up to 3.13.0-27-generic but is broken in every version I've tested of the 3.13 kernels. It works in both of the 3.14 kernels I've tested, so it looks like it got broken somewhere between 3.13.0-27-generic and 3.13.0-29-generic.