Comment 7 for bug 1156306

The patch mentioned in comment #6 should be in the upstream kernel as of v3.9-rc2:

git describe --contains cf0a6584aa6d382f802f2c3cacac23ccbccde0cd
v3.9-rc2~15^2~6^2~42

This can be confirmed by testing the latest 3.9 final kernel, which can be downloaded from:
http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.9.3-saucy/