Comment # 1 on bug 83996 from Christian König

Created attachment 106432 [details] [review]
Test for reverting the patch in question.

It's unlikely that the patch you mentioned causes such problems, but the patch
directly before this one could.

The attached patch (on top of Alex drm-fixes-3.17 branch) reverts this patch
and adds a few extra debug log lines.

So please test and report back with a new dmesg log.