Re: USB device not recognized - all used to work - new info
From: Dave (funinatl_at_hotmail.com)
Date: 02/16/04
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Date: Mon, 16 Feb 2004 14:27:22 GMT
You may have tried this but it worked for me in a similar situation. I
unplugged all of the USB devices. Then I deleted the devices and hub from
the device manager. Then I rebooted letting it find the hub again. Then
I plugged in each USB device one at a time and it discovered them fine.
"david" <david308@hotmail.com> wrote in message
news:271f2bde.0402160008.1511b995@posting.google.com...
> dear all,
>
> some new info to share, and may be this is a little closer in solving
> the problem.
>
> recap: my usb2.0 devices are showing up as unknown deviced in device
> manager, have tried everything including deleting root hub and host
> controller.... windows came back and recognised everything except for
> the 2.0 devices (which include a usb memory reader, and a scanner)
>
> have also applied the latest patches of everything....... and most
> importantly, all these things at one point worked on this system, and
> I think it's after some windows update that this thing start failing.
>
> new info:
>
> This is where it gets interesting. If I delete just the usb host
> controller (sis enhance controller) then the system will immediately
> recongised the usb memory reader and the scanner, but will of course
> tells me that I am plugging usb 2 devices into usb 1.0 ports. What
> this tells me is that the hw and the devices are all working, and
> there is something wrong with the software configuration....
>
> I have tried to apply a good version of the usbehci.sys driver, tried
> to clean up all existing usbehci.sys files except for the one in
> systmer32/drivers directory. I have updated that file to the latest
> from microsoft, which is version 1243. none of these helped. As soon
> as I re-enable the enhanced usb host controller in device manager, the
> usb member reader and scanner will become unknown device again.
>
> so close.... and still so frustrating. Well, at least I can do a
> temporary get around when I need to.....
>
> any thought to this?
>
> david
>
>
> david308@hotmail.com (david) wrote in message
news:<271f2bde.0401211855.7177a7bc@posting.google.com>...
> > Dear all,
> >
> > have a urgent question. I have XP Pro, and have scanner and printer
> > and memory card reader, etc. plugged in a usb 2,0 hub, all working
> > before of course.
> >
> > then this weekend, I did a windows update and applied some of the
> > patches, and all of a sudden, my scanner is not being recognized, my
> > card reader is not recognized, strange enough, my printer is
> > recognised but as if a new device. I then of course restore the
> > system back to a couple of weeks ago when I know everything is working
> > - no luck, everything is still not recognized.
> >
> > I tried installed the driver manually, no luck. the system don't even
> > know what devices those are.
> >
> > does anyone have this problem? please help.
> >
> > david
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- In reply to: david: "Re: USB device not recognized - all used to work - new info"
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