I have spoken with Gigabyte about broken ASPM and this was his response.
Thank you for your kindly mail and inquiry. About the issue you mentioned, since our products only support Windows OS, we do not receive proper driver from chipset vender, we cannot guarantee Linux to work on our system. We suggest you to install Windows OS to prevent having problems. If you install the Windows OS and still have any problems, please provide the error message screenshot for us, so we can try to see how to help. Sorry for the inconvenience.