I'd like to add that I'm seeing this bug as well. I'm trying a variety of USB 3.0 and 2.0 devices in my on-board ports, nothing works. Disabling XHCI or EHCI does nothing, but all of this works perfectly inside Windows. I'm on a MSI 970 Gaming motherboard, V22.2 BIOS, booting using Legacy/UEFI mode. I'm on Ubuntu 14.04 and I didn't see any of this working before the install either. My USB 3.0 chipset is designed by VIA.
When running dmesg, this is part of what I see that could be the missing USB ports: [ 15.508483] usb 10-1: new high-speed USB device number 2 using xhci_hcd [ 15.510503] init: plymouth-splash main process (2042) terminated with status 1 [ 28.735253] xhci_hcd 0000:03:00.0: Stopped the command ring failed, maybe the host is dead [ 28.761562] xhci_hcd 0000:03:00.0: Host not halted after 16000 microseconds. [ 28.761564] xhci_hcd 0000:03:00.0: Abort command ring failed [ 28.761572] xhci_hcd 0000:03:00.0: HC died; cleaning up [ 28.761591] xhci_hcd 0000:03:00.0: Timeout while waiting for setup device command [ 28.761598] usb 10-1: hub failed to enable device, error -62 [ 28.761626] usb usb10-port1: couldn't allocate usb_device I have other devices plugged in, namely a USB mouse and keyboard, and these pick up through EHCI a little lower down in the log. -- 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