On Wed, 12 Sep 2012, Michal Nowak wrote:
> From https://bugzilla.kernel.org/show_bug.cgi?id=47421:
>
> I have problems with Samsung SCX-3205 scanner on Toshiba Satellite L855.
> When is scanner connected to the notebook (via USB) I can see it via
> `scanimage -L` on first attempt but on any other attempt I can't see it
> any more, unless I turn the scanner off and on.
>
> Currently using 3.5.3-1.fc17.x86_64 kernel (but it also happens with
> 3.6.0-0.rc4.git2.1.fc18). The latest working kernel is 2.6.39-1.fc16 on
> that hardware (2.6.40 which was in fact 3.0, I guess, does not work).
>
> That scanner with identical OS - Fedora 17 - worked well on Lenovo T510
> (Sandy Bridge -- USB 2.0 only), the new Toshiba L855 (Ivy Bridge with
> USB 3.0 -- xHCI) fails here.
>
> I somehow think it's related to the xhci driver, hence Cc-ing Sarah. Is
> there a way how to disable xhci driver in favor of ehci (xhci and ehci
> are both compiled-in), so I can try with ehci?
I can't help with the xHCI problem, but here's how you can disable the
xhci-hcd driver:
echo 0000:00:14.0 >/sys/bus/pci/drivers/xhci_hcd/unbind
Alan Stern
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