https://bugs.freedesktop.org/show_bug.cgi?id=79980
--- Comment #238 from agapito tcxjy@vomoto.com --- I had this bug again :S
Using KDE 5, i had 2 crashes when i changed speed animation in systemsettings5 - screens and monitor - compositor options.
My system is Archlinux 64 bits, kernel 3.19.3 and mesa 10.5.2. I can't report any dmesg or log, my system completely freezes.