Comment 25 for bug 1656605

Correct, the v4.4-wily kernel is an upstream version of the kernel with no Ubuntu customization. That is the reason we need to go back in time and test the older Ubuntu kernels to find the specific version when the bug was introduced. That will allow us to bisect and find the exact commit that caused the regression.

Can you test test the 4.2.0-16.19 kernel:
https://launchpad.net/~canonical-kernel-team/+archive/ubuntu/ppa/+build/8099558

That is the earliest pre-built Xenial kernel, so if that kernel has the bug, I'll have to build older versions.