Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758315Ab3HITfH (ORCPT ); Fri, 9 Aug 2013 15:35:07 -0400 Received: from iolanthe.rowland.org ([192.131.102.54]:56266 "HELO iolanthe.rowland.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1758318Ab3HITfF (ORCPT ); Fri, 9 Aug 2013 15:35:05 -0400 Date: Fri, 9 Aug 2013 15:35:04 -0400 (EDT) From: Alan Stern X-X-Sender: stern@iolanthe.rowland.org To: Thomas Richter cc: linux@brodo.de, Subject: Re: [HANG] Trouble with NEC-based USB adapter in PCMCIA slot on E7110 In-Reply-To: <52054306.20500@rus.uni-stuttgart.de> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1642 Lines: 42 On Fri, 9 Aug 2013, Thomas Richter wrote: > On 09.08.2013 19:46, Alan Stern wrote: > > 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. > > Will try and report back, thanks. I've bisected it down in the meantime > to a change from 2.6.31.6 to 2.6.32.6. Interestingly, this is very much > the same time when the udev userland changed. It works with 2.6.31.6 old > udev, but not with 2.6.36.2, new udev. Can't you use the new udev with the old kernel? > Probably the handover from full speed to USB 2.0 got broken? The handover goes the other way, from EHCI to OHCI. > Note that this laptop has now both uhci (legacy) and ohci (as by the > pcmcia card, as companion of the ehci) chips, which probably adds to the > problem. That should not make any difference. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/