James Cloos wrote in comment 34: > Switching to the performance govenor, removing the drive and re-adding it > worked around the bug. > > Something must be blocking power to the xhci when the cpu is saving power...?
I believe that USB autosuspend is the culprit here. I'm seeing this problem on Fedora Linux as well, so I suspect it's an upstream bug. For those of you who are having this problem: please try disabling USB autosuspend on all USB devices, by running the following command as root: $ for F in /sys/bus/usb/devices/*/power/control; do echo on >"${F}"; done You can then verify that the power control status for all devices is "on", not "auto". E.g.: $ grep . /sys/bus/usb/devices/*/power/control /sys/bus/usb/devices/1-1/power/control:on /sys/bus/usb/devices/1-2/power/control:on /sys/bus/usb/devices/7-1/power/control:on /sys/bus/usb/devices/7-2/power/control:on /sys/bus/usb/devices/usb1/power/control:on /sys/bus/usb/devices/usb2/power/control:on /sys/bus/usb/devices/usb3/power/control:on /sys/bus/usb/devices/usb4/power/control:on /sys/bus/usb/devices/usb5/power/control:on /sys/bus/usb/devices/usb6/power/control:on /sys/bus/usb/devices/usb7/power/control:on /sys/bus/usb/devices/usb8/power/control:on If you do this, do your USB3 ports work properly? (For me, on Fedora Linux, disabling USB autosuspend made all my USB ports work perfectly.) Note: if you've already caused the xhci_hcd driver to die, you'll need to reboot first. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1242321 Title: USB 3.0 Harddrive not recognised Status in linux package in Ubuntu: Confirmed Bug description: Ubuntu is not recognising any device plugged into any USB 3.0 ports. Sometimes Ubuntu will freeze for a few seconds when you plug something into a USB 3.0 port; when Ubuntu comes out of the freeze, the device is still NOT recognised. No problems with USB 2.0 ports and devices. The USB 3.0 on this computer only works in Windows 7 (I'm dual booting Ubuntu 13.10 and Windows 7, both are 64-bit). To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1242321/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp