linux-kernel - Re: USB serial regression 2.6.31.1 -> 2.6.31.2 (and 2.6.32-rc3)

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Date:	Fri, 9 Oct 2009 22:03:02 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
cc:	Greg KH <greg@...ah.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	Hugh Blemings <hugh@...mings.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: USB serial regression 2.6.31.1 -> 2.6.31.2 (and 2.6.32-rc3)

On Fri, 9 Oct 2009, Alan Stern wrote:

> On Sat, 10 Oct 2009, Benjamin Herrenschmidt wrote:
> 
> > (Adding Rafael)
> > 
> > On Sat, 2009-10-10 at 11:31 +1100, Benjamin Herrenschmidt wrote:
> > > On Sat, 2009-10-10 at 11:25 +1100, Benjamin Herrenschmidt wrote:
> > > > Hi folks !
> > > > 
> > > > My USB GSM modem (Huawei 169, pretty common stuff) stopped working in
> > > > the latest ubuntu karmic update. So far, I tracked it down to a
> > > > regression that happened in the stable releases between 2.6.31.1 and
> > > > 2.6.31.2 (still present in .3). I haven't tested 2.6.32-rc* yet and
> > > > haven't had a chance to bisect (need to make myself a trimmed
> > > > down .config first).

> This looks a lot like a hardware problem, such as bad USB cables.  
> Could you collect a usbmon trace for bus 4?  It ought to show whether
> this is the case or whether software is at fault.

If it's not a hardware issue and the modem really does work okay in 
2.6.31.1, you should also collect a usbmon trace under that kernel for 
comparison.

Alan Stern

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