Comment 29 for bug 1350480

Correct, the offending commit is 1f81b6d22a5980955b01e08cf27fb745dc9b686f. A patched has been proposed in the 3.16 kernel instead of a revert. That patch is undergoing testing now. I've also build a test kernel with this patch at:

http://kernel.ubuntu.com/~jsalisbury/kirkland/

However, that is the latest mainline kernel and not a Trusty kernel.