2014-06-28, 13:43
Here is the upstream bugreport: https://bugs.freedesktop.org/show_bug.cgi?id=78960 <- you can subscribe yourself and get new information. Workaround is what FernetMenta wrote. This will produce a bit more CPU load, but will cure that behaviour.
Edit: I added "Current Issues" to the first page.
Edit: I added "Current Issues" to the first page.