https://bugs.freedesktop.org/show_bug.cgi?id=80419
--- Comment #86 from Nicolai Hähnle nhaehnle@gmail.com --- Many thanks for your patience! While I still did not see a crash, valgrind does indeed report errors when playing back your crash. It is possible that such errors are indirectly related to the lockup, if they lead to bad data being sent to the card. Today's my last day before the holidays, but I'll look into this next week.