with the workaround, it also worked for me with i915.modeset=1 set to
grub. But with the last kernel-update i run again in the error.
workaround wasn't working for me. at the end, this helped me in /etc
/initramfs-tools/modules

...
fbcon
intel_agp
agpgart

i think fbcon is not needed anymore, was another workaround for black
screen

>has anyone got a clue why this only affects every Xth boot?
i think the problem is, when initrd gets updated. maybe dependencies of the 
modules were not set correctly and drm is complied (and loaded) into kernel 
before agpgart-intel

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