I tried (already installed) 3.11.0-17-generic kernel (I thought it is not so important to test exactly the kernel version you pointed out), and issue also did NOT go away. It is still here. So it really seems that it is not kernel bug. But it is apparently bug.
I tried (already installed) 3.11.0-17-generic kernel (I thought it is not so important to test exactly the kernel version you pointed out), and issue also did NOT go away. It is still here. So it really seems that it is not kernel bug. But it is apparently bug.