Comment 34 for bug 1542939

In comment #33, commit 4cd3991 is superfluous. I have verified that the bug can be fixed on my hardware by applying a single cherry-pick to the xenial (Ubuntu-4.4.0-22.39) kernel,

git am 0001-drm-atomic-Remove-drm_atomic_connectors_for_crtc.patch # 14de6c4 backported to xenial

Thanks to the following comment for suggesting that commit 4cd3991 is superfluous,
https://lists.ubuntu.com/archives/kernel-team/2016-May/077206.html