I should have mentioned that I see the error message also if the NVidia Optimus BIOS option is disabled in contrast to what was reported here: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/888764 . The error message is printed about every second even if the system does not freeze, so I can't say with certainty that it is casually related to the freezes I encountered. It pretty much renders dmesg useless. Trying to exclude an hardware error I have also tested with older kernels v3.9 and an ubuntu 13.04 LiveCD. With all of them I see the error message.
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