[sane-devel] scanimage -L not responding

[Andrea Vai]

Hi,
Il giorno mar, 08/01/2019 alle 16.07 +0100, Johannes Meixner ha
scritto:
> Hello,
> 
> On Jan 8 11:44 Andrea Vai wrote (excerpt):
> >
> > $ lsusb |grep Canon
> > Bus 003 Device 010: ID 04a9:2206 Canon, Inc. CanoScan N650U/N656U
> >
> > $ scanimage -d plustek:libusb:003:010 --format=jpeg -p -v --mode
> Gray
> > --resolution 150 -x 215 -y 297 > test.jpg
> >
> > does not respond.
> >
> > The same device works on windows, with the same usb port, same
> cable
> > and same hardware (well, actually it is a Virtual Machine inside
> the
> > linux box).
> >
> > Also, trying again scanimage -L it hangs for >15 minutes, then I
> kill
> > it and try again in Windows it still work :-/
> 
> Nowadays "xhci_hcd" kernel driver/module issues (a.k.a. "USB 3")
> are the most often cause of inexplicable issues with USB scanners,
> cf.
> 
http://lists.alioth.debian.org/pipermail/sane-devel/2016-November/034901.html
> and follow the links therein.

Thank you for all the valuable information you provided me. Indeed,
the only definitive solution was to install a PCI USB 2.0 card, and
connect the scanner directly to it. 

Thank you very much,
Andrea