Disable xhci_hcd USB 3.0 module

[Gustavo Duarte]

Hi Greg,

The Notebook has physically 2 port USB 2.0 and one port USB 3.0. The
manufacturer specs says that and the output of the command lsusb says
the same:

$ lsusb

Bus 001 Device 002: ID 058f:6254 Alcor Micro Corp. USB Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 003: ID 5986:024b Acer, Inc

>What type of application isn't compatible with xhci-hcd?  Shouldn't we
>fix something like this in the kernel as this isn't a good thing to
>have.

The app, is a SDK of Robootic kits programming for kids.
http://www.lejos.org/nxt/nxj/tutorial/Preliminaries/GettingStartedLinux.htm
The bug is on the firmware-library of the SDK, so there isn't to fix
on kernel/driver side.

I'm using the kernel compilde by ubuntu 12.04,

$ uname -r
3.8.0-33-generic

And i would like still using that, without recompile it, for this
reason is my question, how can i disable xhci_hcd driver without
recompile it. ?

I hope the explanation of my problem be clear enough.

Thanks in advance.

Gustavo.

On Mon, Dec 15, 2014 at 1:30 PM, Greg KH <gregkh at linuxfoundation.org> wrote:
> On Mon, Dec 15, 2014 at 01:04:57PM -0200, Gustavo Duarte wrote:
>> Hi guys,
>>
>> I have a notebook with 2 ports USB 2.0 and one USB 3.0.
>>
>> For some reason, kernel uses xhci_hcd module driver for all the three ports.
>
> Then you really have 3 USB 3 ports in the system.
>
>> Since I have an application that isn't compatilbe with xhci_hcd
>> driver, I need disable it, and force the use of ehci-pc driver.
>
> What type of application isn't compatible with xhci-hcd?  Shouldn't we
> fix something like this in the kernel as this isn't a good thing to
> have.
>
>> My question is, since xhci_hcd is compiled inside the kernel, how can
>> i do to disable it, without re-compile the kernel ?
>
> You control where the driver is compiled, why not change it if needed?
>
> confused,
>
> greg k-h