[sane-devel] Xsane can't find scanner - again, but this one is USB

[MR ZenWiz]

It's worse.

I plugged in my Canon LiDE scanner and it shows up on lsusb:

mar at marbase:~ $ lsusb
Bus 002 Device 002: ID 8087:8001 Intel Corp.
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 8087:8009 Intel Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 008: ID 04a9:220e Canon, Inc. CanoScan N1240U/LiDE 30
Bus 003 Device 002: ID 04f9:0040 Brother Industries, Ltd
Bus 003 Device 005: ID 046d:c517 Logitech, Inc. LX710 Cordless Desktop Laser
Bus 003 Device 006: ID 413c:2011 Dell Computer Corp. Multimedia Pro Keyboard
Bus 003 Device 004: ID 413c:1005 Dell Computer Corp. Multimedia Pro Keyboard Hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

xsane hung after this.  I unplugged the scanner and plugged the HP
back in, and the Canon showed up in xsane, but of course it didn't
work.  I switched the cable back, and xsane hung again.  So I ran
sane-find-scanner:

mar at marbase:~ $ sudo sane-find-scanner
[sudo] password for mar:

  # sane-find-scanner will now attempt to detect your scanner. If the
  # result is different from what you expected, first make sure your
  # scanner is powered up and properly connected to your computer.

  # No SCSI scanners found. If you expected something different, make sure that
  # you have loaded a kernel SCSI driver for your SCSI adapter.

found USB scanner (vendor=0x04a9 [Canon], product=0x220e [CanoScan])
at libusb:003:008
  # Your USB scanner was (probably) detected. It may or may not be supported by
  # SANE. Try scanimage -L and read the backend's manpage.

  # Not checking for parallel port scanners.

  # Most Scanners connected to the parallel port or other proprietary ports
  # can't be detected by this program.

Now xsane can't find any scanner, so I can't scan anything.

WTF?



On Thu, Oct 29, 2015 at 11:12 PM, MR ZenWiz <mrzenwiz at gmail.com> wrote:
> Last time I had this problem, it was on my laptop at my friend's house
> with a wireless HP Envy printer.  Eventually that worked when I added
> the printer through CUPS.
>
> At home, I run Xubuntu 14.04.3 with an HP 5740 all-in-one attached on
> the USB (bus 3, device 14).
>
> When I first installed this it was fine, everything worked.
>
> Tonight I tried to scan a document, and xsane can't find the
> scanner/printer/etc.
>
> I removed it with CUPS and reinstalled - no change.
>
> I removed it and used the Xubuntu printer manager to install it, and
> even printed a test page, and that works, and it now shows up in CUPS,
> but xsane still can't find the scanner.
>
> Why does xsane have so much trouble locating what's there and operational?
>
> How does it manage to forget what used to be there (and still is)?
>
> (For the record, hp-setup also can't seem to find the device, even
> when I tell it the USB bus and device id.).
>
> So what else do I need to do to get xsane to recognize this thing
> again so I can use it?
>
> At this point I have to go back to my Canon LiDE scanner, which I like
> but it has no feeder.
>
> This is most frustrating.  I hate to say it, but Windows never has
> this problem, and I'm no fan of that PoS.
>
> MR