linux-kernel - Re: Regression from 2.6.21 to 2.6.22 and above

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Date:	Thu, 11 Oct 2007 19:15:16 -0400
From:	Chuck Ebbert <cebbert@...hat.com>
To:	Stefan Scheler <stefan@...eler.com>
CC:	linux-kernel@...r.kernel.org
Subject: Re: Regression from 2.6.21 to 2.6.22 and above

On 10/11/2007 06:41 AM, Stefan Scheler wrote:
> Hello,
> 
> my Kobil KAAN Professional (USB variant) smartcard reader stopped
> working when upgrading from 2.6.21 to 2.6.22 (and 2.6.23). Not working
> means that the latest libct.so supplied from Kobil is segfaulting when
> trying to access the device. But as far as I can see the kobil_sct
> driver itself didn't change from 2.6.21 to 2.6.22. Any ideas what is
> going on here?
> 
> Thanks in advance. I will provide additional information if needed.
> 

Try turning off USB autosuspend by adding the kernel option
"usbcore.autosuspend=-1". Or if your USB is modular, add "autosuspend=-1"
to the module parameters.

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