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Date: Fri, 9 Aug 2013 13:46:40 -0400 (EDT)
From: Alan Stern <stern@rowland.harvard.edu>
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To: Thomas Richter <richter@rus.uni-stuttgart.de>
cc: linux@brodo.de, <linux-kernel@vger.kernel.org>
Subject: Re: [HANG] Trouble with NEC-based USB adapter in PCMCIA slot on
 E7110
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On Fri, 9 Aug 2013, Thomas Richter wrote:

> Hi Alan, hi Dominik,
> 
> maybe you want me to help out a bit - I'm having trouble getting a 
> Delock PCMCIA to USB-2 adapter to work under linux, with strange 
> behavior in some situations. The trouble is that while I can *read* via 
> fast (usb 2.0) transfers from the port, an ehci-triggered write just 
> locks up (it does not Oops, though) and I'm pretty much stuck narrowing 
> down the problem.

The best way to start will be to enable CONFIG_USB_DEBUG in your kernel 
and post the dmesg log.  Also post a usbmon trace showing what happens 
when you try to write something.

Alan Stern