New answers tagged xrandr
I upgraded to debian Jessie and the problem disappeared. This makes me think that it was simply that Wheezy doesn't support newer technology.
Most likely you are using the wrong driver. You should do a lspci -vnn and search for VGA display and controller, see which driver (if any) you are using. For instance, for use with Intel hardware, you should download and install the package xserver-xorg-video-intel, for which the package man page states This package also provides XvMC (XVideo ...
The user who answered the question and then deleted the answer was actually right. Upgraded my mint to 17 and now the freeze-problem is gone.
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