Comment 27 for bug 1648388

@Lo, It sounds like the 4.10-rc3 kernel exhibits the bug on 16.04 but not on 14.04, is that correct? That might indicate the bug outside of the kernel.

Can you test the 4.11-rc1 kernel with 16.04? That kernel can be downloaded from:
http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.11-rc1/

It might also be worth while to test the current daily iso image from:
Desktop:
http://cdimage.ubuntu.com/daily-live/current/
Server:
http://cdimage.ubuntu.com/ubuntu-server/daily/current/