I have a Biostar P35D2-A7 mainboard with Realtek RTL-8110SC/8169SC Gigabit Ethernet controller (rev 10) with the same problem described here.
I don't know why, but I solved it enabling "Legacy Mode Support" in "Integrated Peripherals" => "OnChip Device" BIOS settings.
Now it works fine for me...
I have a Biostar P35D2-A7 mainboard with Realtek RTL-8110SC/8169SC Gigabit Ethernet controller (rev 10) with the same problem described here.
I don't know why, but I solved it enabling "Legacy Mode Support" in "Integrated Peripherals" => "OnChip Device" BIOS settings.
Now it works fine for me...