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List:       linux-usb-users
Subject:    [Linux-usb-users] Re: Problems with full speed devices on High speed USB 2.0 hubs
From:       Alan Stern <stern () rowland ! harvard ! edu>
Date:       2005-08-31 17:44:59
Message-ID: Pine.LNX.4.44L0.0508311342370.13401-100000 () iolanthe ! rowland ! org
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On Wed, 31 Aug 2005, Karl Hiramoto wrote:

> Is there more documentation somewhere on this problem of full speed 
> devices on a high speed hub on any site?  I have had issues both in 
> Linux and windows when running many full speed devices into a high speed 
> hub.  What we have done to fix it was replace the high speed hub with a 
> full speed one.  In windows we also noticed if you disabled the EHCI   
> problems went away too.   I'll have to give the  "rmmod ehci-hcd" in 
> linux a try now too. Thanks!

Take a look at

	http://www.linux-usb.org/usb2.html

Especially the "Linux Status" section, "Host Controller Driver Support" 
subsection, although the section on Transaction Translators is applicable 
as well.

Of course, none of the information there applies directly to Windows.

Alan Stern



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