Hello. This bug should be closed. I mixed up an error message from a vanilla kernel (which of course shouldn't bother Debian) and a very similar looking one for the Debian kernel, where the firmware was simply actually missing. I fixed it for the Debian kernel by simply updating the initramfs while having the firmware in the proper place, and for the vanilla kernel by including the the firmware blob into the kernel. Thanks for hints and sorry about the bother.
Greetings, Sebastian
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