Comment 18 for bug 1318551

Another update on this to track down the problem further:

I've tested several kernels from http://kernel.ubuntu.com/~kernel-ppa/mainline

What I did was installing every final kernel so I noticed the last one working without this problem seems to be http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.7.10-raring/

http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.8.13.28-raring/ did fail for me as well.

So the problem seems to be introduced between the both versions.

I will try now some other 3.8.x to see if it appeared there from beginning.