Phy ID from good kernel:
$ cat /sys/devices/pci0000:00/0000:00:0a.0/0000:03:00.0/mdio_bus/r8169-300/r8169-300:00/phy_id 0xc2077002
Both r8169.ko and realtek.ko exist in /lib/modules for both the good and bad kernels - I'm not sure if that's what you wanted to know?
Phy ID from good kernel:
$ cat /sys/devices/ pci0000: 00/0000: 00:0a.0/ 0000:03: 00.0/mdio_ bus/r8169- 300/r8169- 300:00/ phy_id
0xc2077002
Both r8169.ko and realtek.ko exist in /lib/modules for both the good and bad kernels - I'm not sure if that's what you wanted to know?