Comment 13 for bug 1454796

That's good news, so this is fixed upstream. We can perform a "Reverse" bisect to identify the exact commit that fixes this.

First, can you test the latest upstream 3.19 kernel to see if the fix in mainline was already sent to stable? It can be downloaded from:
http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.19.8-vivid/