[sane-devel] Xerox 3220 USB problem

Stef stef.dev at free.fr
Sun Jun 30 14:38:51 UTC 2013

On 30/06/2013 15:12, m. allan noah wrote:
>>> The usb problem with xerox_mfp was that `scanimage -L` shows the
>>> xerox_mfp device only once, then it disappears. I need to replug the
>>> USB in order to see it again, but this also means I cannot scan with
>>> xerox_mfp. I can only reproduce this on a new laptop with usb 3.0
>>> ports. Same kernel and SANE, old laptop -> no problem.
>>> There is no problem with smfp, aside from the speed.
>> Ah. Thanks for exmplaining.
>>> I can only reproduce this on a new laptop with usb 3.0
>> xerox_mfp driver is also using internal sanei library for workign with
>> usb. So problem may be there. (I don't know what smfp driver is using.)
> Email threads of the past few weeks have made it clear that there is
> some sort of USB 3 problem with sane-backends. Perhaps this would be a
> good opportunity to investigate the problem- Could you get usbmon logs
> of both drivers making identical scans. These two logs could be
> compared to see why the vendor software is so slow, and might give us
> a clue to fix the usb issue with sane backends, removing the need for
> the vendor driver.
> allan

     I second this. We can also add this bug from the tracker.



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