I was having the same problem with a number of USB3 harddisks, upgrading to 4.0.1 from the mainline PPA has fixed it for me.
I think it might be triggered by my Yubikey security key. I get "WARN Event TRB for slot 8 ep 4 with no TDs queued?" when gpg accesses the key. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1371233 Title: USB 3.0 connection is unreliable + xHCI xhci_drop_endpoint called with disabled ep To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1371233/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
