If the 4.4 kernel resolves this bug, I can help you perform a reverse bisect.
Can you also give the latest upstream 4.2 stable kernel a try, to see if the fix in mainline was also cc'd to stable? The upstream 4.2 kernel can be downloaded from:
http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.2.8-ckt1-wily/
If the 4.4 kernel resolves this bug, I can help you perform a reverse bisect.
Can you also give the latest upstream 4.2 stable kernel a try, to see if the fix in mainline was also cc'd to stable? The upstream 4.2 kernel can be downloaded from:
http:// kernel. ubuntu. com/~kernel- ppa/mainline/ v4.2.8- ckt1-wily/