Comment 37 for bug 1242321

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.