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Re: kern/46696: uhub disables port where USB keyboard attached

The following reply was made to PR kern/46696; it has been noted by GNATS.

From: Matthias Drochner <>
Cc: Andreas Gustafsson <>, 
Subject: Re: kern/46696: uhub disables port where USB keyboard attached
Date: Sat, 22 Sep 2012 14:28:54 +0200

 On Tue, 18 Sep 2012 09:53:41 +0200
 Matthias Drochner <> wrote:
 > It is also strange that it hands over the device to USB1 at all,
 > should better stay on ehci... Need to check specs for compatibility
 > requirements.
 I've identified the problem. Out reset is too long. It collides
 with a timeout in the USB3 spec.
 > > Matthias, can you identify the USB device that prompted the above
 > > commit?  And if it is a full-speed device, would it be possible
 > > to use the 64-byte request size for full-speed devices but not
 > > low-speed ones?
 > I'm not 100% sure. Probably some Atmel-based embedded design.
 > This is most certainly a full speed one, so it is better to
 > restrict the effect of your patch to low-speed.
 Here is a citation which confirms what I said about the 64-byte
 best regards

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