Re: [linux-usb-devel] Re: [2.6.x] USB Zip drive kills ps2 mouse.

[Alan Stern]

On Fri, 5 Mar 2004, Jamie Lokier wrote:

> > I've narrowed it down to the uhci_hcd module -- all the rest can
> > be compiled in or as modules, doesn't matter.
> > 
> > Just in case I was vague:  the Zip drive works great regardless --
> > it's only the ps2 mouse which is affected by this weird problem.
> > No cursor movement at all if the Zip is plugged in during boot.
> 
> I don't know if it's related, but whenever I load the uhci_hcd module
> on my laptop, or whenever I plug in a USB device while that module is
> loaded (sorry, I forget which and can't test it now) - the floppy disk
> motor and light are turned on for a couple of seconds!
> 
> Now, why would a USB event trigger the floppy disk motor?  It doesn't
> happen with 2.4, and it doesn't happen on my desktop machine which is
> OHCI+EHCI.
> 
> Perhaps the uhci_hcd driver is trampling on some ISA I/O port that it
> shouldn't be, which is causing both my floppy motor oddity and your
> mouse problem?
> 
> -- Jamie

No, the uhci-hcd driver isn't stepping on any extraneous ISA I/O ports.

Walt's problem was the result of a buggy BIOS, and turning off legacy USB 
support in the BIOS fixed it.  Maybe your problem is similar, though it's 
hard to imagine how.

I've got 3 computers with UHCI controllers.  On none of them does a USB 
event cause the floppy disk drive to do anything.

Alan Stern

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