As there are no volunteers to maintain 340xx after 1 year + and it is now also FBTFS it has been retired in master and untagged for F31+
I think killing off the 340 drivers is best... My son still has a 390 only supported video card but I don't have the skills to fix kernel issues, just general packaging problems.
He mostly games in Windows right now so maybe he can just use nouveau on Fedora :|
Thanks,
Richard