linux-kernel - Re: [linux-usb-devel] Error -71 on device descriptor read/all

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Date:	Tue, 19 Jun 2007 20:56:50 +0200
From:	Oliver Neukum <oliver@...kum.org>
To:	Paul Walmsley <paul@...yaka.com>
Cc:	linux-usb-devel@...ts.sourceforge.net,
	Chuck Ebbert <cebbert@...hat.com>,
	"Renato S. Yamane" <renatoyamane@...dic.com.br>,
	linux-kernel@...r.kernel.org
Subject: Re: [linux-usb-devel] Error -71 on device descriptor read/all

Am Dienstag, 19. Juni 2007 schrieb Paul Walmsley:
> On Tue, 19 Jun 2007, Oliver Neukum wrote:
> 
> > Am Dienstag, 19. Juni 2007 schrieb Chuck Ebbert:
> >
> >> Try disabling CONFIG_USB_SUSPEND
> >>
> >> [usb developers: what are the drawbacks of doing this?]
> >
> > Increased power consumption.
> 
> speaking of CONFIG_USB_SUSPEND, I've encountered at least one device -- a 
> Canon EOS 5D camera -- that, after the bus suspends, must be powercycled 
> in order to return the camera's interrupt endpoints to a functional state. 
> How are these types of problems handled, currently?  Is this something for 
> a blacklist?

drivers/usb/core/quirks.c

Please try the reset-resume quirk before you use the no-autosuspend quirk.

	Regards
		Oliver

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