I searched but I only found an error with different symptoms but the same log message: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1301398 As it claims that it was fixed in 3.15, I installed 3.16.0-37-generic from Utopic and voilà: It works without problems and error messages. So I am in a better position than Kamil in #28 but as I am even using the same model of notebook (different hardware configuration possible) we still do not know why it occurs.
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