I'm having an issue with my on-board Intel Ethernet running Kalyway. Initially I had it working with the 82566mm Intel kext.

I had to run the fix for the mismatch kernal and system version(usb mounting fault). After running it it will not recognize that the cable is plugged in (could be a coincidence). I have deleted and re-installed the kext, with no luck. I have also tried others, but get a kernal panic on most and have to remove them in single user mode.