sane-find-scanner finds it, scanimage -L does not

[Marius Gedminas]

On Wed, May 13, 2009 at 02:55:15PM +0200, Wybo Dekker wrote:
> I have an Epson Perfection V350 scanner and two machines with jaunty:
> - an HP-Compaq, where the scanner works flawlessly, and
> - a NEC, where sane-find-scanner finds it, but scanimage -L does not.
> 
> The relevant files on both machines are the same:
> - /etc/sane.d/dll.conf (completely commented out)
> - /etc/sane.d/epkowa.conf (with usb 0x04b8 0x012f, pointing directly to
>    the scanner)
> - /etc/sane.d/dll.d/hplib (completely commented out)
> - /etc/sane.d/dll.d/libsane-extras (commented out, except for epkowa)
> - /etc/udev/rules.d/45-libsane.rules (was absent on the NEC, copied it
>    from the compaq)

Some scanners also need a firmware file in /usr/share/sane/, you may
want to check whether the contents of that directory are the same on
both machines.

> sane-find-scanner says, on both machines:
> found USB scanner (vendor=0x04b8 [EPSON], product=0x012f [EPSON 
> Scanner]) at libusb:001:003
> 
> scanimage -L says on the Compaq:
> device `epkowa:libusb:001:003' is a Epson Perfection V350 flatbed scanner
> 
> but on the NEC:
> No scanners were identified. If you were expecting something different,
> check that the scanner is plugged in, turned on and detected by the
> sane-find-scanner tool (if appropriate). Please read the documentation
> which came with this software (README, FAQ, manpages).

My first instinct (having been burned before, once) would be to check
the permissions of that device.  The first step would be to see if

   sudo scanimage -L

finds the scanner on the NEC.  If so, you have a permission problem.

Ubuntu handles scanner permissions via ConsoleKit by setting filesystem
ACLs on the relevant USB devices.  Check whether

  getfacl /dev/bus/usb/001/003

shows that your user has access to the USB device.  Check whether
ck-list-sessions sees your login session.  Check whether logging out and
logging in fixes the problem.

HTH,
Marius Gedminas
-- 
"You know, you never truly appreciate how handy living next to a creek
is until you are on fire."
                -- James Nicoll, rec.arts.sf.written, 1/25/05
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