Both PCIe bridge and Realtek NIC are runtime suspended. When ethernet cable is plugged, PMEStatus and PMEPending are marked:
RootSta: PME ReqID 0200, PMEStatus+ PMEPending+

But the IRQ isn't raised:
$ cat /proc/interrupts  | grep PME
 145:          0          0          0          0          0          0          0          0          0          0          0          0   VMD-MSI  126  PCIe PME, aerdrv, pcie-dpc

So the hotplug event isn't detected.