>Hi there
Thanks for the info. The hub that I was having the problem with is an
un-powered one.
However, after some trawling about on the net, I discovered that, by
default, in Windows XP, the USB ports attached to the motherboard have a
Power Management facility switched ON. Unfortunately, as Microsoft know,
it doesn't always reset completely when you send something to the
printer or whatever, but only when you use a hub, equipment plugged into
"original" ports are ok.
By de-selecting this option manually via Device Manager; USB Root;
Properties; Power Management, the ports don't "go to sleep" and thus the
problem disappeared.
It worked for me and when I told our IT lads at work, they had never
heard of this, so I don't think it's well documented.
Best regards, Pete Sowerby......
> From: joseph marty <[log in to unmask]>
> Date: 2004/02/03 Tue PM 04:23:13 GMT
> To: [log in to unmask]
> Subject: Re: [PCBUILD] USB Hub Problems
>
> Have you looked in device manager to see if the hub is sharing an Interrupt Request (IRQ) with another device? In most cases it will show that there is a conflict. Does the hub have an AC adapter for being self-powered. You are running a lot of stuff from it for the bus to be powering it. You may need to use the AC adapter if you aren't already.
>
> >Hi there
> >
> >I've got a small 4 port USB hub that plugs into one of the USB ports on my PC. At the moment I have a digital camera/webcam and my Epson printer connected via this.
> >
> >The problem is that although it works fine initially, it appears to stop working and my system fails to recognise it after it has been connected for a while.
> >
> >If I plug the equipment directly into the ports on the PC, there are no problem, so the ports are working fine, just when I add the equipment via this hub. On disconnecting and re-connecting, it works again, for a while!!
> >
> >This is the second hub to have this problem (different makes each one) so all I can presume is that it's something else.
> >
> >The PC spec is:
> >1.6GHz AMD K6 Processor
> >256Mb RAM
> >Windows XP Professional O/S
> >
> >Any advice would be appreciated.
> >
> >Best regards, Pete Sowerby...........
> >
> > PCBUILD's List Owners:
> > Bob Wright<[log in to unmask]>
> > Drew Dunn<[log in to unmask]>
> >
>
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