[sane-devel] Timeouts: usb_reset seems necessary to avoid bulk timeouts.

Olaf Meeuwissen olaf@epkowa.co.jp
Fri, 11 Jun 2004 09:37:21 +0900

Tom Schutzer-Weissmann <misc@tomweissmann.org> writes:

> On Thu, 10 Jun 2004 05:36:52 -0400
> Karl Heinz Kremer <khk@khk.net> wrote:
>> I'm also reading sane-devel, so no need to take a detour with
>> any Epson backend related information :-)
>> I've never experienced any of the problem you describe, and I've
>> been running a 2.6.x kernel for some time now (SuSE 9.1 beta versions
>> and the final SuSE 9.1).
>> I've tried this with two different USB controllers (USB-1.1 and high
>> speed USB-2) with a number of different Epson scanners.
>> Karl Heinz
> Thank you for all your responses.
> I'm using Debian unstable, kernel 2.6.6 with ohci_usb, libusb-0-1.4
> (0.1.8-11). The scanner is an Epson Perfection 2450.

That's what you get for running bleeding edge ;-)

I'm using Debian testing, kernel 2.6.6 with uhci_hcd (and ehci_hcd),
libusb-0.1-4 (0.1.8-11) and will see if I can lay my hands on a
Perfection 2450.

The USB modules are autoprobed, I don't have anything USB related in
my /etc/modules-2.6.  There is an usb-uhci in my /etc/modules but IIRC
that file is not used if /etc/modules-2.6 exists.

> It seems libusb isn't working as it should - maybe future Debian
> updates will solve the problem; in the meantime I am happy with my
> hack, but if anyone would like me to try out some suggestions to get
> to the bottom of this mystery, I'd be happy to help off-list.

As I'm using the same libusb as you do, I am sceptical about libusb
being the culprit.  Apart from the usb module and scanner model, we
use the same setup.  I'll get back with the results on the Perfection
2450 ASAP.

Olaf Meeuwissen                            EPSON KOWA Corporation, PF1
FSF Associate Member #1962           sign up at http://member.fsf.org/
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Penguin's lib!       -- I hack, therefore I am --               LPIC-2