Comment # 238 on bug 79980 from agapito

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.