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SubjectRe: [linux-usb-devel] Error -71 on device descriptor read/all
On Tue, 19 Jun 2007, Paul Walmsley wrote:

> 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?

There are a few possible approaches. One is indeed a blacklist, to
prevent the camera from automatically being suspended. Another is to
prevent it by changing a device parameter in sysfs.

Note that neither of these will help if you do a suspend-to-RAM. That
suspends everything.

Alan Stern

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