Hi giganode,
[ 43.663221] i915 0000:00:02.1: GuC interface version 0.1.0.0
[ 43.663869] i915 0000:00:02.1: IOV: Failed to get runtime info (-EPROTO)
[ 43.669365] i915 0000:00:02.1: Device initialization failed (-71)
[ 43.669368] i915: probe of 0000:00:02.1 failed with error -71
According these info from your dmesg, I can locate the error in running this function. It happens when not enough MMIO resources for SR-IOV.
Can you add "pci=realloc,assign-busses" to your boot kernel command line to have a try?
By the way, I don't know how to see your signature to get your hardware info.