Ken, That's great news, that hang was quite the head scratcher. - Chris <div class="gmail_quote">On 25 Dec 2015 14:34, "Kenneth Graunke" <<a href="mailto:kenneth@whitecape.org">kenneth@whitecape.org</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">This morning, I woke up and somehow "knew" what was causing my HS GPU hangs on Gen7/7.5. It turns out I was (completely) wrong, but through some miraculous series of illogical leaps, I arrived at a solution anyway. I don't honestly know how I got it working on Christmas Eve after failing to figure it out for months on end. After exhausting every bit of documentation and every tool available, and finding zero information, somehow randomly flailing in the dark resulted in a solution, today of all days. Honestly, I had pretty much no hope for figuring this out, so I'm relieved to have it working at last... It turns out that setting interleave on the EOT URB write does bad things. Fixing this fixed all the GPU hangs when releasing inputs one at a time, I then added back the ability to release inputs in pairs, which caused more GPU hangs. It turned out I needed to be more careful and enable both halves. Everything seems to be working just fine now, so let's turn it on. --Ken _______________________________________________ mesa-dev mailing list <a href="mailto:mesa-dev@lists.freedesktop.org">mesa-dev@lists.freedesktop.org</a> <a href="http://lists.freedesktop.org/mailman/listinfo/mesa-dev" rel="noreferrer" target="_blank">http://lists.freedesktop.org/mailman/listinfo/mesa-dev</a> </blockquote></div>