Daniel, I've already tried Ville's patch you've mentioned with no luck.
Kindly find unpatched v4.5-rc3 dmesg with drm debug enabled here: [1] [1] https://gist.github.com/efb44b7c6bc325978b80 11.02.2016 10:21, Daniel Vetter wrote: > Please boot with drm.debug=0xe and attach the dmesg. Also please test > the > patch later on in this thread: > > https://lkml.org/lkml/2016/2/9/587 > > Ville is working on a proper fix for this specific case. But could be > that > you're hitting yet another issue.