Comment 17 for bug 1180419

Would it be possible for you to also test the latest 3.8 stable kernel, which is 3.8.13:
http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.8.13-raring/

You may need to perform the same steps as in comment #16. If you need to do that, the latest stable kernel can be found at:
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git

If the bug still exists in 3.8.13, we can perform a reverse bisect to identify the commit that fixes this in 3.9.