Comment # 15 on bug 898395 from Bit Juggler

As promised i did some more testing with my desktop (Motherboard: MSI
MS-7918/Z97 GAMING 3 (MS-7918), BIOS V2.3 07/24/2014).

In all tests i started the machine, logged in as root, plugged the device into
an USB port, saved the dmesg result and then restarted the machine. I did this
for every USB2.0 and for every USB3.0 port available.

The first device tested was the USB2.0 bluetooth adapter (0400:080a).

Plugging it into any of the USB2.0 ports resulted in a message like this:

[   34.960224] usb 3-8: new full-speed USB device number 4 using xhci_hcd
[   35.113171] usb 3-8: device descriptor read/64, error -71
[   35.214125] xhci_hcd 0000:00:14.0: Setup ERROR: setup context command for
slot 3.
[   35.214138] usb 3-8: hub failed to enable device, error -22
[   35.367109] usb 3-8: new full-speed USB device number 5 using xhci_hcd
[   50.726177] usb 3-8: new full-speed USB device number 6 using xhci_hcd
[   50.894418] usb 3-8: New USB device found, idVendor=0400, idProduct=080a
[   50.894425] usb 3-8: New USB device strings: Mfr=0, Product=0,
SerialNumber=0
[   50.905560] usbcore: registered new interface driver btusb

Plugging it into any of the USB3.0 ports resulted in a message like this:

[   41.450928] usb 3-11: new full-speed USB device number 4 using xhci_hcd
[   41.603992] usb 3-11: device descriptor read/64, error -71
[   41.704915] xhci_hcd 0000:00:14.0: Setup ERROR: setup context command for
slot 3.
[   41.704921] usb 3-11: hub failed to enable device, error -22
[   41.857890] usb 3-11: new full-speed USB device number 5 using xhci_hcd
[   57.216902] usb 3-11: new full-speed USB device number 6 using xhci_hcd
[   57.385223] usb 3-11: New USB device found, idVendor=0400, idProduct=080a
[   57.385232] usb 3-11: New USB device strings: Mfr=0, Product=0,
SerialNumber=0
[   57.400856] usbcore: registered new interface driver btusb


The second device tested was an USB2.0 Canon scanner "CanoScan LiDE700F
(04a9:1907)" which is currently used with the desktop and works with openSUSE
13.2 on that machine.

Plugging it into any of the USB2.0 ports resulted in a message like this:

[   44.594128] usb 3-8: new high-speed USB device number 4 using xhci_hcd
[   44.759627] usb 3-8: New USB device found, idVendor=04a9, idProduct=1907
[   44.759634] usb 3-8: New USB device strings: Mfr=1, Product=2,
SerialNumber=0
[   44.759638] usb 3-8: Product: CanoScan
[   44.759642] usb 3-8: Manufacturer: Canon

Plugging it into any of the USB3.0 ports resulted in a message like this:

[  178.405949] usb 3-11: new high-speed USB device number 4 using xhci_hcd
[  178.571387] usb 3-11: New USB device found, idVendor=04a9, idProduct=1907
[  178.571395] usb 3-11: New USB device strings: Mfr=1, Product=2,
SerialNumber=0
[  178.571400] usb 3-11: Product: CanoScan
[  178.571403] usb 3-11: Manufacturer: Canon


The third device tested was an USB2.0 Netgear wireless adapter WG111v2
(0846:6a00) which is currently not used with the desktop, but works with
openSUSE 13.2 on this machine.

Plugging it into any of the USB2.0 ports resulted in a message like this:

[   56.063756] usb 3-8: new high-speed USB device number 4 using xhci_hcd
[   56.232714] usb 3-8: New USB device found, idVendor=0846, idProduct=6a00
[   56.232722] usb 3-8: New USB device strings: Mfr=1, Product=2,
SerialNumber=3
[   56.232727] usb 3-8: Product: NETGEAR WG111v2
[   56.232731] usb 3-8: Manufacturer: NETGEAR WG111v2
[   56.232734] usb 3-8: SerialNumber: 00184639AF36
[   56.361766] ieee80211 phy1: Selected rate control algorithm 'minstrel_ht'
[   56.361969] ieee80211 phy1: hwaddr xx:xx:xx:xx:xx:xx, RTL8187vB (default) V1
+ rtl8225z2, rfkill mask 2
[   56.369903] rtl8187: Customer ID is 0xFF
[   56.370256] rtl8187: wireless switch is on
[   56.370296] usbcore: registered new interface driver rtl8187
[   58.149302] IPv6: ADDRCONF(NETDEV_UP): wlp0s20u8: link is not ready

Plugging it into any of the USB3.0 ports resulted in a message like this:

[   56.468661] usb 3-11: new high-speed USB device number 4 using xhci_hcd
[   56.637653] usb 3-11: New USB device found, idVendor=0846, idProduct=6a00
[   56.637660] usb 3-11: New USB device strings: Mfr=1, Product=2,
SerialNumber=3
[   56.637664] usb 3-11: Product: NETGEAR WG111v2
[   56.637668] usb 3-11: Manufacturer: NETGEAR WG111v2
[   56.637671] usb 3-11: SerialNumber: 00184639AF36
[   56.764615] ieee80211 phy1: Selected rate control algorithm 'minstrel_ht'
[   56.764761] ieee80211 phy1: hwaddr xx:xx:xx:xx:xx:xx, RTL8187vB (default) V1
+ rtl8225z2, rfkill mask 2
[   56.772725] rtl8187: Customer ID is 0xFF
[   56.773044] rtl8187: wireless switch is on
[   56.773066] usbcore: registered new interface driver rtl8187
[   58.551182] IPv6: ADDRCONF(NETDEV_UP): wlp0s20u11: link is not ready


For all USB2.0 devices xhci_hcd is used no matter whether they are plugged into
an USB2.0 or an USB3.0 port. 

In none of the tests it made any difference whether i used the ports direct on
the motherboard or the ones redirected to the front panel of my desktop.