[sane-devel] Canoscan LiDE 25 detected by find-scanner, not scanimage

[Chris]

Hi there,

I've recently bought a Canoscan LIDE 25 and managed to get it working
on my Ubuntu 5.10 laptop using the CVS code.  Unfortunately I can't
get the same scanner working on an Ubuntu 5.10 desktop machine using
the same procedure.  I would really appreciate someone helping me make
sense of the error message.

I did the following exactly as per the successful laptop install:

- download cvs nightly code
- ./configure --prefix=/usr
- make
- sudo make install

But I get the following results:

sane-fine-scanner

found USB scanner (vendor=0x04a9 [Canon], product=0x2220 [CanoScan],
chip=LM9832/3) at libusb:002:003

scanimage -L  (the output is the same as root)

device `v4l:/dev/video0' is a Noname Hauppauge WinTV 34xxx models virtual device

It seems odd that SANE is picking up the TV card - is this a problem? 
As you can see the canoscan doesn't appear.

After reading around the list archive and some forums I tried the following:

export SANE_DEBUG_PLUSTEK=12
export SANE_DEBUG_DLL=12

scanimage -L  (again, the output is the same as root)

[sanei_debug] Setting debug level of dll to 12.
[dll] sane_init: SANE dll backend version 1.0.11 from sane-backends 1.0.16-cvs
[dll] sane_init: reading dll.conf
[dll] add_backend: adding backend `net'
[dll] add_backend: adding backend `abaton'
[dll] add_backend: adding backend `agfafocus'
[dll] add_backend: adding backend `apple'
[dll] add_backend: adding backend `avision'
[dll] add_backend: adding backend `artec'
[dll] add_backend: adding backend `artec_eplus48u'
[dll] add_backend: adding backend `as6e'
[dll] add_backend: adding backend `bh'
[dll] add_backend: adding backend `canon'
[dll] add_backend: adding backend `canon630u'
[dll] add_backend: adding backend `coolscan'
[dll] add_backend: adding backend `coolscan2'
[dll] add_backend: adding backend `dmc'
[dll] add_backend: adding backend `epson'
[dll] add_backend: adding backend `fujitsu'
[dll] add_backend: adding backend `gt68xx'
[dll] add_backend: adding backend `hp'
[dll] add_backend: adding backend `hpsj5s'
[dll] add_backend: adding backend `hp5400'
[dll] add_backend: adding backend `ibm'
[dll] add_backend: adding backend `leo'
[dll] add_backend: adding backend `ma1509'
[dll] add_backend: adding backend `matsushita'
[dll] add_backend: adding backend `microtek'
[dll] add_backend: adding backend `microtek2'
[dll] add_backend: adding backend `mustek'
[dll] add_backend: adding backend `mustek_usb'
[dll] add_backend: adding backend `nec'
[dll] add_backend: adding backend `niash'
[dll] add_backend: adding backend `pie'
[dll] add_backend: adding backend `plustek'
[dll] add_backend: adding backend `qcam'
[dll] add_backend: adding backend `ricoh'
[dll] add_backend: adding backend `s9036'
[dll] add_backend: adding backend `sceptre'
[dll] add_backend: adding backend `sharp'
[dll] add_backend: adding backend `sm3600'
[dll] add_backend: adding backend `snapscan'
[dll] add_backend: adding backend `sp15c'
[dll] add_backend: adding backend `tamarack'
[dll] add_backend: adding backend `teco1'
[dll] add_backend: adding backend `teco2'
[dll] add_backend: adding backend `teco3'
[dll] add_backend: adding backend `u12'
[dll] add_backend: adding backend `umax'
[dll] add_backend: adding backend `umax1220u'
[dll] add_backend: adding backend `v4l'
[dll] add_backend: adding backend `hpoj'
[dll] add_backend: adding backend `hpaio'
[dll] sane_get_devices
[dll] load: searching backend `hpaio' in `/usr/lib/sane'
[dll] load: trying to load `/usr/lib/sane/libsane-hpaio.so.1'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-hpaio.so.1'
[dll] init: initializing backend `hpaio'
[dll] init: backend `hpaio' is version 1.0.6
[dll] load: searching backend `hpoj' in `/usr/lib/sane'
[dll] load: trying to load `/usr/lib/sane/libsane-hpoj.so.1'
[dll] load: couldn't open `/usr/lib/sane/libsane-hpoj.so.1' (No such
file or directory)
[dll] load: couldn't find backend `hpoj' (No such file or directory)
[dll] load: searching backend `v4l' in `/usr/lib/sane'
[dll] load: trying to load `/usr/lib/sane/libsane-v4l.so.1'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-v4l.so.1'
[dll] init: initializing backend `v4l'
[dll] init: backend `v4l' is version 1.0.4
[dll] load: searching backend `umax1220u' in `/usr/lib/sane'
[dll] load: trying to load `/usr/lib/sane/libsane-umax1220u.so.1'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-umax1220u.so.1'
[dll] init: initializing backend `umax1220u'
[dll] init: backend `umax1220u' is version 1.0.1
[dll] load: searching backend `umax' in `/usr/lib/sane'
[dll] load: trying to load `/usr/lib/sane/libsane-umax.so.1'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-umax.so.1'
[dll] init: initializing backend `umax'
[dll] init: backend `umax' is version 1.0.44
[dll] load: searching backend `u12' in `/usr/lib/sane'
[dll] load: trying to load `/usr/lib/sane/libsane-u12.so.1'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-u12.so.1'
[dll] init: initializing backend `u12'
[dll] init: backend `u12' is version 1.0.0
[dll] load: searching backend `teco3' in `/usr/lib/sane'
[dll] load: trying to load `/usr/lib/sane/libsane-teco3.so.1'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-teco3.so.1'
[dll] init: initializing backend `teco3'
[dll] init: backend `teco3' is version 1.0.1
[dll] load: searching backend `teco2' in `/usr/lib/sane'
[dll] load: trying to load `/usr/lib/sane/libsane-teco2.so.1'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-teco2.so.1'
[dll] init: initializing backend `teco2'
[dll] init: backend `teco2' is version 1.0.9
[dll] load: searching backend `teco1' in `/usr/lib/sane'
[dll] load: trying to load `/usr/lib/sane/libsane-teco1.so.1'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-teco1.so.1'
[dll] init: initializing backend `teco1'
[dll] init: backend `teco1' is version 1.0.10
[dll] load: searching backend `tamarack' in `/usr/lib/sane'
[dll] load: trying to load `/usr/lib/sane/libsane-tamarack.so.1'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-tamarack.so.1'
[dll] init: initializing backend `tamarack'
[dll] init: backend `tamarack' is version 1.0.0
[dll] load: searching backend `sp15c' in `/usr/lib/sane'
[dll] load: trying to load `/usr/lib/sane/libsane-sp15c.so.1'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-sp15c.so.1'
[dll] init: initializing backend `sp15c'
[dll] init: backend `sp15c' is version 1.0.0
[dll] load: searching backend `snapscan' in `/usr/lib/sane'
[dll] load: trying to load `/usr/lib/sane/libsane-snapscan.so.1'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-snapscan.so.1'
[dll] init: initializing backend `snapscan'
[dll] init: backend `snapscan' is version 1.4.49
[dll] load: searching backend `sm3600' in `/usr/lib/sane'
[dll] load: trying to load `/usr/lib/sane/libsane-sm3600.so.1'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-sm3600.so.1'
[dll] init: initializing backend `sm3600'
[dll] init: backend `sm3600' is version 1.0.6
[dll] load: searching backend `sharp' in `/usr/lib/sane'
[dll] load: trying to load `/usr/lib/sane/libsane-sharp.so.1'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-sharp.so.1'
[dll] init: initializing backend `sharp'
[dll] init: backend `sharp' is version 1.0.0
[dll] load: searching backend `sceptre' in `/usr/lib/sane'
[dll] load: trying to load `/usr/lib/sane/libsane-sceptre.so.1'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-sceptre.so.1'
[dll] init: initializing backend `sceptre'
[dll] init: backend `sceptre' is version 1.0.10
[dll] load: searching backend `s9036' in `/usr/lib/sane'
[dll] load: trying to load `/usr/lib/sane/libsane-s9036.so.1'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-s9036.so.1'
[dll] init: initializing backend `s9036'
[dll] init: backend `s9036' is version 1.0.0
[dll] load: searching backend `ricoh' in `/usr/lib/sane'
[dll] load: trying to load `/usr/lib/sane/libsane-ricoh.so.1'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-ricoh.so.1'
[dll] init: initializing backend `ricoh'
[dll] init: backend `ricoh' is version 1.0.0
[dll] load: searching backend `qcam' in `/usr/lib/sane'
[dll] load: trying to load `/usr/lib/sane/libsane-qcam.so.1'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-qcam.so.1'
[dll] init: initializing backend `qcam'
[dll] init: backend `qcam' is version 1.0.0
[dll] load: searching backend `plustek' in `/usr/lib/sane'
[dll] load: trying to load `/usr/lib/sane/libsane-plustek.so.1'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-plustek.so.1'
[dll] init: initializing backend `plustek'
[sanei_debug] Setting debug level of plustek to 12.
[plustek] Plustek backend V0.50-7, part of sane-backends 1.0.16-cvs
[plustek] Retrieving all supported and conntected devices
[plustek] Available and supported devices:
[plustek] NONE.
[plustek] ># Plustek-SANE Backend configuration file<
[plustek] ># For use with LM9831/2/3 based USB scanners<
[plustek] >#<
[plustek] ><
[plustek] ># each device needs at least two lines:<
[plustek] ># - [usb] vendor-ID and product-ID<
[plustek] ># - device devicename<
[plustek] ># i.e. for Plustek (0x07B3) UT12/16/24 (0x0017)<
[plustek] ># [usb] 0x07B3 0x0017<
[plustek] ># device /dev/usbscanner<
[plustek] ># or<
[plustek] ># device libusb:bbb:ddd<
[plustek] ># where bbb is the busnumber and ddd the device number<
[plustek] ># make sure that your user has access to /proc/bus/usb/bbb/ddd<
[plustek] >#<
[plustek] ># additionally you can specify some options<
[plustek] ># warmup, lOffOnEnd, lampOff<
[plustek] >#<
[plustek] ># For autodetection use<
[plustek] ># [usb]<
[plustek] ># device /dev/usbscanner<
[plustek] >#<
[plustek] ># or simply<
[plustek] ># [usb]<
[plustek] >#<
[plustek] ># or if you want a specific device but you have no idea about the<
[plustek] ># device node or you use libusb, simply set vendor- and product-ID<
[plustek] ># [usb] 0x07B3 0x0017<
[plustek] ># device auto<
[plustek] >#<
[plustek] ># NOTE: autodetection is safe, as it uses the info it got<
[plustek] >#       from the USB subsystem. If you're not using the<
[plustek] >#       autodetection, you MUST have attached that device<
[plustek] >#       at your USB-port, that you have specified...<
[plustek] >#<
[plustek] ><
[plustek] >[usb] 0x04a9 0x2220<
[plustek] next device is a USB device (0x04A9-0x2220)
[plustek] ... next device
[plustek] ><
[plustek] >#<
[plustek] ># options for the previous USB entry<
[plustek] >#<
[plustek] ># switch lamp off after xxx secs, 0 disables the feature<
[plustek] ># (can also be set via frontend)<
[plustek] >option lampOff 300<
[plustek] Decoding option >lampOff<
[plustek] ><
[plustek] ># warmup period in seconds, 0 means no warmup, -1 means auto-warmup<
[plustek] ># (can also be set via frontend)<
[plustek] >option warmup -1<
[plustek] Decoding option >warmup<
[plustek] ><
[plustek] ># 0 means leave lamp-status untouched, not 0 means switch off<
[plustek] ># on sane_close<
[plustek] ># (can also be set via frontend)<
[plustek] >option lOffOnEnd 1<
[plustek] Decoding option >lOffOnEnd<
[plustek] ><
[plustek] >#<
[plustek] ># options to tweak the image start-position<
[plustek] ># (WARNING: there's no internal range check!!!)<
[plustek] >#<
[plustek] ># for the normal scan area<
[plustek] >#<
[plustek] >option posOffX 0<
[plustek] Decoding option >posOffX<
[plustek] >option posOffY 0<
[plustek] Decoding option >posOffY<
[plustek] ><
[plustek] ># for transparencies<
[plustek] >option tpaOffX 0<
[plustek] Decoding option >tpaOffX<
[plustek] >option tpaOffY 0<
[plustek] Decoding option >tpaOffY<
[plustek] ><
[plustek] ># for negatives<
[plustek] >option negOffX 0<
[plustek] Decoding option >negOffX<
[plustek] >option negOffY 0<
[plustek] Decoding option >negOffY<
[plustek] ><
[plustek] >#<
[plustek] ># for setting the calibration strip position<
[plustek] ># (WARNING: there's no internal range check!!!)<
[plustek] ># -1 means use built in<
[plustek] ># (can also be set via frontend)<
[plustek] >option posShadingY -1<
[plustek] Decoding option >posShadingY<
[plustek] >option tpaShadingY -1<
[plustek] Decoding option >tpaShadingY<
[plustek] >option negShadingY -1<
[plustek] Decoding option >negShadingY<
[plustek] ><
[plustek] >#<
[plustek] ># to invert the negatives, 0 disables the feature<
[plustek] >#<
[plustek] >option invertNegatives 0<
[plustek] Decoding option >invertNegatives<
[plustek] ><
[plustek] >#<
[plustek] ># to disable the internal sensor speedup function,<
[plustek] ># 1 disables the feature<
[plustek] >#<
[plustek] >option disableSpeedup 0<
[plustek] Decoding option >disableSpeedup<
[plustek] ><
[plustek] >#<
[plustek] ># to save/restore coarse calibration data<
[plustek] ># (can also be set via frontend)<
[plustek] >option cacheCalData 0<
[plustek] Decoding option >cacheCalData<
[plustek] ><
[plustek] >#<
[plustek] ># use alternate calibration routines<
[plustek] >#<
[plustek] >option altCalibration 0<
[plustek] Decoding option >altCalibration<
[plustek] ><
[plustek] >#<
[plustek] ># for skipping whole calibration step<
[plustek] >#<
[plustek] >option skipCalibration 0<
[plustek] Decoding option >skipCalibration<
[plustek] ><
[plustek] >#<
[plustek] ># for skipping entire fine calibration step<
[plustek] ># coarse calibration is done<
[plustek] >#<
[plustek] >option skipFine 0<
[plustek] Decoding option >skipFine<
[plustek] ><
[plustek] >#<
[plustek] ># discard the result of the fine white calibration<
[plustek] >#<
[plustek] >option skipFineWhite 0<
[plustek] Decoding option >skipFineWhite<
[plustek] ><
[plustek] ># for replacing the gain values found during coarse<
[plustek] ># calibration<
[plustek] ># (can also be set via frontend)<
[plustek] >option red_gain   -1<
[plustek] Decoding option >red_gain<
[plustek] >option green_gain -1<
[plustek] Decoding option >green_gain<
[plustek] >option blue_gain  -1<
[plustek] Decoding option >blue_gain<
[plustek] ><
[plustek] ># for replacing the offset values found during coarse<
[plustek] ># calibration<
[plustek] ># (can also be set via frontend)<
[plustek] >option red_offset   -1<
[plustek] Decoding option >red_offset<
[plustek] >option green_offset -1<
[plustek] Decoding option >green_offset<
[plustek] >option blue_offset  -1<
[plustek] Decoding option >blue_offset<
[plustek] ><
[plustek] >#<
[plustek] ># for replacing the default lampoff settings, this<
[plustek] ># works only for CIS devices like CanoScan LiDE20<
[plustek] ># (can also be set via frontend)<
[plustek] >option red_lampoff   -1<
[plustek] Decoding option >red_lampoff<
[plustek] >option green_lampoff -1<
[plustek] Decoding option >green_lampoff<
[plustek] >option blue_lampoff  -1<
[plustek] Decoding option >blue_lampoff<
[plustek] ><
[plustek] >#<
[plustek] ># for adjusting the default gamma values<
[plustek] ># (can also be set via frontend)<
[plustek] >option redGamma         1.0<
[plustek] Decoding option >redGamma<
[plustek] >option greenGamma       1.0<
[plustek] Decoding option >greenGamma<
[plustek] >option blueGamma        1.0<
[plustek] Decoding option >blueGamma<
[plustek] >option grayGamma        1.0<
[plustek] Decoding option >grayGamma<
[plustek] ><
[plustek] >#<
[plustek] ># to enable TPA (EPSON or UMAX, if autodetection fails)<
[plustek] ># 0 means default behaviour as specified in the internal tables<
[plustek] ># 1 means enable (needed for UMAX 3450)<
[plustek] >option enableTPA 0<
[plustek] Decoding option >enableTPA<
[plustek] ><
[plustek] >#<
[plustek] ># model override functionality, currently only available for<
[plustek] ># Mustek devices, using NSCs' vendor ID: 0x0400 and<
[plustek] ># also their product ID: 0x1000 (LM9831) 0x1001 (LM9832)<
[plustek] >#<
[plustek] ># mov/PID    |    0x1000   |   0x1001<
[plustek] ># ---------------------------------------<
[plustek] ># 0 (default)| BearPaw1200 | BearPaw 2400<
[plustek] ># 1          |   ignored   | BearPaw 1200<
[plustek] >#<
[plustek] >option mov 0<
[plustek] Decoding option >mov<
[plustek] ><
[plustek] >#<
[plustek] ># and of course the device-name<
[plustek] >#<
[plustek] ># device /dev/usbscanner<
[plustek] >device auto<
[plustek] Decoding device name >auto<
[plustek] ><
[plustek] >#<
[plustek] ># to define a new device, start with a new section:<
[plustek] ># [usb]<
[plustek] >#<
[plustek] attach (auto, 0xbf9b740c, (nil))
[plustek] Device configuration:
[plustek] device name  : >auto<
[plustek] USB-ID       : >0x04A9-0x2220<
[plustek] model ovr.   : 0
[plustek] warmup       : -1s
[plustek] lampOff      : 300
[plustek] lampOffOnEnd : yes
[plustek] cacheCalData : no
[plustek] altCalibrate : no
[plustek] skipCalibr.  : no
[plustek] skipFine     : no
[plustek] skipFineWhite: no
[plustek] invertNegs.  : no
[plustek] dis.Speedup  : no
[plustek] pos_x        : 0
[plustek] pos_y        : 0
[plustek] pos_shading_y: -1
[plustek] neg_x        : 0
[plustek] neg_y        : 0
[plustek] neg_shading_y: -1
[plustek] tpa_x        : 0
[plustek] tpa_y        : 0
[plustek] tpa_shading_y: -1
[plustek] red gain     : -1
[plustek] green gain   : -1
[plustek] blue gain    : -1
[plustek] red offset   : -1
[plustek] green offset : -1
[plustek] blue offset  : -1
[plustek] red lampoff  : -1
[plustek] green lampoff: -1
[plustek] blue lampoff : -1
[plustek] red Gamma    : 1.00
[plustek] green Gamma  : 1.00
[plustek] blue Gamma   : 1.00
[plustek] gray Gamma   : 1.00
[plustek] ---------------------
[plustek] usbDev_open(auto,0x04A9-0x2220) - (nil)
[plustek] sanei_usb_open failed: No such file or directory (2)
[plustek] open failed: -1
[dll] init: backend `plustek' is version 1.0.0
[plustek] sane_get_devices (0xbf9b9558, 0)
[dll] load: searching backend `pie' in `/usr/lib/sane'
[dll] load: trying to load `/usr/lib/sane/libsane-pie.so.1'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-pie.so.1'
[dll] init: initializing backend `pie'
[dll] init: backend `pie' is version 1.0.9
[dll] load: searching backend `niash' in `/usr/lib/sane'
[dll] load: trying to load `/usr/lib/sane/libsane-niash.so.1'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-niash.so.1'
[dll] init: initializing backend `niash'
[dll] init: backend `niash' is version 1.0.1
[dll] load: searching backend `nec' in `/usr/lib/sane'
[dll] load: trying to load `/usr/lib/sane/libsane-nec.so.1'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-nec.so.1'
[dll] init: initializing backend `nec'
[dll] init: backend `nec' is version 1.0.0
[dll] load: searching backend `mustek_usb' in `/usr/lib/sane'
[dll] load: trying to load `/usr/lib/sane/libsane-mustek_usb.so.1'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-mustek_usb.so.1'
[dll] init: initializing backend `mustek_usb'
[dll] init: backend `mustek_usb' is version 1.0.18
[dll] load: searching backend `mustek' in `/usr/lib/sane'
[dll] load: trying to load `/usr/lib/sane/libsane-mustek.so.1'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-mustek.so.1'
[dll] init: initializing backend `mustek'
[dll] init: backend `mustek' is version 1.0.138
[dll] load: searching backend `microtek2' in `/usr/lib/sane'
[dll] load: trying to load `/usr/lib/sane/libsane-microtek2.so.1'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-microtek2.so.1'
[dll] init: initializing backend `microtek2'
[dll] init: backend `microtek2' is version 1.0.0
[dll] load: searching backend `microtek' in `/usr/lib/sane'
[dll] load: trying to load `/usr/lib/sane/libsane-microtek.so.1'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-microtek.so.1'
[dll] init: initializing backend `microtek'
[dll] init: backend `microtek' is version 1.0.0
[dll] load: searching backend `matsushita' in `/usr/lib/sane'
[dll] load: trying to load `/usr/lib/sane/libsane-matsushita.so.1'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-matsushita.so.1'
[dll] init: initializing backend `matsushita'
[dll] init: backend `matsushita' is version 1.0.7
[dll] load: searching backend `ma1509' in `/usr/lib/sane'
[dll] load: trying to load `/usr/lib/sane/libsane-ma1509.so.1'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-ma1509.so.1'
[dll] init: initializing backend `ma1509'
[dll] init: backend `ma1509' is version 1.0.3
[dll] load: searching backend `leo' in `/usr/lib/sane'
[dll] load: trying to load `/usr/lib/sane/libsane-leo.so.1'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-leo.so.1'
[dll] init: initializing backend `leo'
[dll] init: backend `leo' is version 1.0.11
[dll] load: searching backend `ibm' in `/usr/lib/sane'
[dll] load: trying to load `/usr/lib/sane/libsane-ibm.so.1'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-ibm.so.1'
[dll] init: initializing backend `ibm'
[dll] init: backend `ibm' is version 1.0.0
[dll] load: searching backend `hp5400' in `/usr/lib/sane'
[dll] load: trying to load `/usr/lib/sane/libsane-hp5400.so.1'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-hp5400.so.1'
[dll] init: initializing backend `hp5400'
[dll] init: backend `hp5400' is version 1.0.3
[dll] load: searching backend `hpsj5s' in `/usr/lib/sane'
[dll] load: trying to load `/usr/lib/sane/libsane-hpsj5s.so.1'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-hpsj5s.so.1'
[dll] init: initializing backend `hpsj5s'
[dll] init: backend `hpsj5s' is version 1.0.3
[dll] load: searching backend `hp' in `/usr/lib/sane'
[dll] load: trying to load `/usr/lib/sane/libsane-hp.so.1'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-hp.so.1'
[dll] init: initializing backend `hp'
[dll] init: backend `hp' is version 1.0.8
[dll] load: searching backend `gt68xx' in `/usr/lib/sane'
[dll] load: trying to load `/usr/lib/sane/libsane-gt68xx.so.1'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-gt68xx.so.1'
[dll] init: initializing backend `gt68xx'
[dll] init: backend `gt68xx' is version 1.0.78
[dll] load: searching backend `fujitsu' in `/usr/lib/sane'
[dll] load: trying to load `/usr/lib/sane/libsane-fujitsu.so.1'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-fujitsu.so.1'
[dll] init: initializing backend `fujitsu'
[dll] init: backend `fujitsu' is version 1.0.0
[dll] load: searching backend `epson' in `/usr/lib/sane'
[dll] load: trying to load `/usr/lib/sane/libsane-epson.so.1'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-epson.so.1'
[dll] init: initializing backend `epson'
[dll] init: backend `epson' is version 1.0.245
[dll] load: searching backend `dmc' in `/usr/lib/sane'
[dll] load: trying to load `/usr/lib/sane/libsane-dmc.so.1'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-dmc.so.1'
[dll] init: initializing backend `dmc'
[dll] init: backend `dmc' is version 1.0.0
[dll] load: searching backend `coolscan2' in `/usr/lib/sane'
[dll] load: trying to load `/usr/lib/sane/libsane-coolscan2.so.1'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-coolscan2.so.1'
[dll] init: initializing backend `coolscan2'
[dll] init: backend `coolscan2' is version 1.0.0
[dll] load: searching backend `coolscan' in `/usr/lib/sane'
[dll] load: trying to load `/usr/lib/sane/libsane-coolscan.so.1'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-coolscan.so.1'
[dll] init: initializing backend `coolscan'
[dll] init: backend `coolscan' is version 1.0.0
[dll] load: searching backend `canon630u' in `/usr/lib/sane'
[dll] load: trying to load `/usr/lib/sane/libsane-canon630u.so.1'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-canon630u.so.1'
[dll] init: initializing backend `canon630u'
[dll] init: backend `canon630u' is version 1.0.1
[dll] load: searching backend `canon' in `/usr/lib/sane'
[dll] load: trying to load `/usr/lib/sane/libsane-canon.so.1'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-canon.so.1'
[dll] init: initializing backend `canon'
[dll] init: backend `canon' is version 1.0.0
[dll] load: searching backend `bh' in `/usr/lib/sane'
[dll] load: trying to load `/usr/lib/sane/libsane-bh.so.1'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-bh.so.1'
[dll] init: initializing backend `bh'
[dll] init: backend `bh' is version 1.0.4
[dll] load: searching backend `as6e' in `/usr/lib/sane'
[dll] load: trying to load `/usr/lib/sane/libsane-as6e.so.1'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-as6e.so.1'
[dll] init: initializing backend `as6e'
[dll] load: searching backend `artec_eplus48u' in `/usr/lib/sane'
[dll] load: trying to load `/usr/lib/sane/libsane-artec_eplus48u.so.1'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-artec_eplus48u.so.1'
[dll] init: initializing backend `artec_eplus48u'
[dll] init: backend `artec_eplus48u' is version 1.0.0
[dll] load: searching backend `artec' in `/usr/lib/sane'
[dll] load: trying to load `/usr/lib/sane/libsane-artec.so.1'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-artec.so.1'
[dll] init: initializing backend `artec'
[dll] init: backend `artec' is version 1.0.0
[dll] load: searching backend `avision' in `/usr/lib/sane'
[dll] load: trying to load `/usr/lib/sane/libsane-avision.so.1'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-avision.so.1'
[dll] init: initializing backend `avision'
[dll] init: backend `avision' is version 1.0.167
[dll] load: searching backend `apple' in `/usr/lib/sane'
[dll] load: trying to load `/usr/lib/sane/libsane-apple.so.1'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-apple.so.1'
[dll] init: initializing backend `apple'
[dll] init: backend `apple' is version 1.0.0
[dll] load: searching backend `agfafocus' in `/usr/lib/sane'
[dll] load: trying to load `/usr/lib/sane/libsane-agfafocus.so.1'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-agfafocus.so.1'
[dll] init: initializing backend `agfafocus'
[dll] init: backend `agfafocus' is version 1.0.0
[dll] load: searching backend `abaton' in `/usr/lib/sane'
[dll] load: trying to load `/usr/lib/sane/libsane-abaton.so.1'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-abaton.so.1'
[dll] init: initializing backend `abaton'
[dll] init: backend `abaton' is version 1.0.0
[dll] load: searching backend `net' in `/usr/lib/sane'
[dll] load: trying to load `/usr/lib/sane/libsane-net.so.1'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-net.so.1'
[dll] init: initializing backend `net'
[dll] init: backend `net' is version 1.0.16
[dll] sane_get_devices: found 1 devices
device `v4l:/dev/video0' is a Noname Hauppauge WinTV 34xxx models virtual device
[dll] sane_exit: exiting
[dll] sane_exit: calling backend `hpaio's exit function
[dll] sane_exit: calling backend `v4l's exit function
[dll] sane_exit: calling backend `umax1220u's exit function
[dll] sane_exit: calling backend `umax's exit function
[dll] sane_exit: calling backend `u12's exit function
[dll] sane_exit: calling backend `teco3's exit function
[dll] sane_exit: calling backend `teco2's exit function
[dll] sane_exit: calling backend `teco1's exit function
[dll] sane_exit: calling backend `tamarack's exit function
[dll] sane_exit: calling backend `sp15c's exit function
[dll] sane_exit: calling backend `snapscan's exit function
[dll] sane_exit: calling backend `sm3600's exit function
[dll] sane_exit: calling backend `sharp's exit function
[dll] sane_exit: calling backend `sceptre's exit function
[dll] sane_exit: calling backend `s9036's exit function
[dll] sane_exit: calling backend `ricoh's exit function
[dll] sane_exit: calling backend `qcam's exit function
[dll] sane_exit: calling backend `plustek's exit function
[plustek] sane_exit
[dll] sane_exit: calling backend `pie's exit function
[dll] sane_exit: calling backend `niash's exit function
[dll] sane_exit: calling backend `nec's exit function
[dll] sane_exit: calling backend `mustek_usb's exit function
[dll] sane_exit: calling backend `mustek's exit function
[dll] sane_exit: calling backend `microtek2's exit function
[dll] sane_exit: calling backend `microtek's exit function
[dll] sane_exit: calling backend `matsushita's exit function
[dll] sane_exit: calling backend `ma1509's exit function
[dll] sane_exit: calling backend `leo's exit function
[dll] sane_exit: calling backend `ibm's exit function
[dll] sane_exit: calling backend `hp5400's exit function
[dll] sane_exit: calling backend `hpsj5s's exit function
[dll] sane_exit: calling backend `hp's exit function
[dll] sane_exit: calling backend `gt68xx's exit function
[dll] sane_exit: calling backend `fujitsu's exit function
[dll] sane_exit: calling backend `epson's exit function
[dll] sane_exit: calling backend `dmc's exit function
[dll] sane_exit: calling backend `coolscan2's exit function
[dll] sane_exit: calling backend `coolscan's exit function
[dll] sane_exit: calling backend `canon630u's exit function
[dll] sane_exit: calling backend `canon's exit function
[dll] sane_exit: calling backend `bh's exit function
[dll] sane_exit: calling backend `artec_eplus48u's exit function
[dll] sane_exit: calling backend `artec's exit function
[dll] sane_exit: calling backend `avision's exit function
[dll] sane_exit: calling backend `apple's exit function
[dll] sane_exit: calling backend `agfafocus's exit function
[dll] sane_exit: calling backend `abaton's exit function
[dll] sane_exit: calling backend `net's exit function
[dll] sane_exit: finished

Presumably the reason it doesn't find the scanner is because of this bit:

[plustek] usbDev_open(auto,0x04A9-0x2220) - (nil)
[plustek] sanei_usb_open failed: No such file or directory (2)
[plustek] open failed: -1

Any idea what could be causing that last parameter to be set to nil?

Many thanks in advance for any comments.

Chris