i know this issues resolved , i have same motherboard and same issue on fedora and ubuntu as well i have fixed with by downloading Realtek drivers for linux and installing with below simple steps (Note * either disable secure boot on motherboard bios under security section or if you prefer to security enabled then create add key to achieve same , below i have disabled the secure boot )
Unpack the tarball : # tar vjxf r8126-10.013.00.bz2Change to the directory:
# cd r8126-10.013.00/
If you are running the target kernel, then you should be able to do :
# ./autorun.sh (as root or with sudo)
You can check whether the driver is loaded by using following commands.
# lsmod | grep r8126