I have found another setting that in my case was the real cause of the problem, namely ASPM (Active State Power Management). I had noticed that I was getting the disabled endpoint error message at odd times, like in the middle of the night, when there was little or no activity to the USB 3 disks attached to the controller. It always struck me as odd that the problem would occur randomly like that and not be clustered around the periods of high activity. It turns out that ASPM was active by default in the BIOS, buried in a power management setting for PCI devices (i.e. it didn't say ASPM in the setting title). Once I turned that setting off all the errors stopped, both when the devices were active and when they were idle. I'm sort of assuming that the issues happens when ASPM tries to turn off or go to a lower power state on the USB controller. I don't know if this is a bug in the BIOS, firmware of the USB controller, or the linux kernel device driver, or a combination of those. Whichever it is though, turning this off in the BIOS solved everything in every kernel version that I've tested. I also installed Arch Linux so that I could try a recent kernel version and it works find there too. So if you are having this problem and it the other solutions haven't worked for you, look for this setting in your BIOS. It might be in the power management section, but also might be in the peripherals, devices, or advanced PCI settings a rea.
-- 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 [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
