https://bugs.freedesktop.org/show_bug.cgi?id=104185

--- Comment #4 from ominous@autistici.org --- For those who experience a freeze, please try the following:

- Switch to a terminal with Ctrl + Alt + F7 - Switch back to your original environment with Ctrl + Alt + F1

I am experience some freezing but I am not entirely sure if it is the same freezing as in this thread. Doing the above trick unfreezes the system.