https://bugs.freedesktop.org/show_bug.cgi?id=93879
--- Comment #6 from Alex Deucher alexdeucher@gmail.com --- (In reply to boombatower from comment #5)
I had planned to test reverting those commits, but after reading through the thread it seems those commits simply further exposed symptoms of a larger issue that I believe was fixed in http://lists.freedesktop.org/archives/dri-devel/2016-January/097880.html.
I am running a 4.4.0 kernel with that patch applied and so far have not seen the issues I described. Although, ironically, on my first boot I had the stuck login screen as described in the thread.
Different issues.