And one more update: I was now able to get a working initrd output, yaiy :). This link [0] got me on the right track, adding the i915 kernel module to the initrd and therefore having an early Kernel-Mode-Setting helped. And from then on, everything else, including X works great with the Intel graphics driver.
So now just the issue with X, kexec and nouveau remains. And the case where it is not possible for someone to add a recent nouveau/i915/radeon module to the initrd. Cheers, Linus [0]: https://wiki.archlinux.org/index.php/Kernel_Mode_Setting#Early_KMS_start -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org