Disable xhci_hcd USB 3.0 module

[Mandeep Sandhu]

As Greg mentioned, there's probably nothing that the software can do.

You can possibly try using different hardware for your host....one
that has a USB 2.0 root hub.

On Mon, Dec 15, 2014 at 1:32 PM, Gustavo Duarte <gus.duarte at gmail.com> wrote:
> Greg,
>
> Thanks for confirm my thought.
>
>  I tried with a kernel 3.16 builded by Ubuntu guys,
> http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.16-utopic/linux-image-3.16.0-031600-generic_3.16.0-031600.201408031935_amd64.deb
>
>
> And the same behaviour, the Roboot lego kit can't establishes the
> communication with the PC.
>
> Do you think that with 3.18 kernel I will have a chance to resolve
> this ? or there aren't significantly changes related tu USB between
> 3.16 and 3.18 version.
>
>
> I guess that the problem is on SDK library usb communication, (libusb)
> i'm going to make a research to this side.
>
> Although this issue isn't resolved your help was very helpful, it was
> like lightning.
>
> Regards.
> Gustavo .
>
> On Mon, Dec 15, 2014 at 7:01 PM, Greg KH <gregkh at linuxfoundation.org> wrote:
>> On Mon, Dec 15, 2014 at 06:47:21PM -0200, Gustavo Duarte wrote:
>>> 00:14.0 USB controller: Intel Corporation ValleyView USB xHCI Host
>>> Controller (rev 0e)
>>>
>>> Subsystem: CLEVO/KAPOK Computer Device 5471
>>>
>>> Kernel driver in use: xhci_hcd
>>
>> One host controller.
>>
>>> Seems like here is happening you are saying, one host-controller
>>> (xHCI) manage the three USB port, right ?
>>
>> Yes.
>>
>>> May be i have a confusion, and i sorry for that, may be what i am
>>> asking it is impossible or may be is a blunder, any way  following is
>>> my thought:
>>> "
>>> I know that there are several PC, Notebooks with BIOS with the
>>> capability to  enable/disable xHCI USB mode, where you can choice,
>>> xHCI or EHCI.
>>> For this reason i thought that could be possible, instead  by BIOS,
>>> through some kernel configuration or passing a switch parameter at
>>> boot time achieve the same behaviour.
>>> "
>>>
>>> Do you are saying that, as this notebook has only one usb
>>> host-controller, these option isn't possible ?
>>
>> Looks like it.  But I don't know what your bios looks like, poke around
>> in there and see if you can find a setting like that.  I've never heard
>> of such a thing though.  The xhci controller is a physical chip, it
>> can't work like a ehci controller.
>>
>>> So the only remainder way to resolve this, is trying with a new one kernel ?
>>
>> To see if the bug you are having with a USB 3 device is fixed, yes.  You
>> will not be able to ever get the ehci driver to work with this device no
>> matter what kernel you change to, sorry.
>>
>> greg k-h
>
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