Fabus, try running "dmesg | grep drm" in a terminal window and see if you have 
lines like:
[ 3.159563] [drm:drm_fill_in_dev] *ERROR* Cannot initialize the agpgart module.
[ 3.159608] [drm:intelfb_restore] *ERROR* Failed to restore crtc configuration: 
-22

-- 
agpgart-intel not loaded before drm sometimes, causes KMS to fail
https://bugs.launchpad.net/bugs/430694
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