This issue also affects MSI's 970A-G46 mainboard with a bulldozer 8-core cpu. On this system the Realtek RTL8111/RTL8168B NIC is also unresponsive along with the USB devices. Luckily I have a PS2 keyboard and was thus able to dig around the booted system a bit using the CLI. dmesg did not report anything untoward about the realtek nic, but the messages about USB devices are as others have already stated.
This issue also affects MSI's 970A-G46 mainboard with a bulldozer 8-core cpu. On this system the Realtek RTL8111/RTL8168B NIC is also unresponsive along with the USB devices. Luckily I have a PS2 keyboard and was thus able to dig around the booted system a bit using the CLI. dmesg did not report anything untoward about the realtek nic, but the messages about USB devices are as others have already stated.