Comment 133 for bug 1166442

@Daniel, please refer to:

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1232877

and:

https://github.com/torvalds/linux/commit/754ac45745711a7ce0067087e5b55a9c277952ad

As you can see, a patch for newer versions has been queued for inclusion in kernel v3.13 and has been merged in v3.13-rc5, available as a mainline build from:

http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.13-rc5-trusty/

just in case you want to give it a try :)