Thanks for confirming that it's a BIOS bug. Did some more research based on this information, found out that Fedora was not booting up on this motherboard a couple years back. Just in case anybody comes across this problem, the fix was to downgrade the BIOS to the 0504 one on the Asus website (provided your CPU is supported by the older BIOS). Everything works fine now, this bug can be marked as "won't fix", thanks.
-- Ubuntu hangs during startup with plugged in USB mouse/keyboard https://bugs.launchpad.net/bugs/437360 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs