[sane-devel] sane-find-scanner finds Canon Canoscan N24OU, scanimage -L does not

[Terry Spearman]

Following debugging suggestions from:

 

https://www.unix.com/man-page/centos/7/sane/

 

I first ran "export SANE_DEBUG_DLL=128" before running scanimage -L to
obtain debugging information

On the first run after rebooting the server scanimage -L gives me:

 

[sanei_debug] Setting debug level of dll to 128.

[dll] sane_init: SANE dll backend version 1.0.13 from sane-backends 1.0.24

[dll] sane_init/read_dlld: attempting to open directory './dll.d'

[dll] sane_init/read_dlld: attempting to open directory '/etc/sane.d/dll.d'

[dll] sane_init/read_dlld: using config directory '/etc/sane.d/dll.d'

[dll] sane_init/read_dlld: done.

[dll] sane_init/read_config: reading dll.conf

[dll] add_backend: adding backend 'net'

[dll] add_backend: adding backend 'plustek'

[dll] sane_get_devices

[dll] load: searching backend 'plustek' in 'usr/lib64/sane'

[dll] load: trying to load 'usr/lib64/sane/libsane-plustek.so.1'

[dll] load: dlopen()ing 'usr/lib64/sane/libsane-plustek.so.1'

[dll] init: initializing backend 'plustek'

[dll] init: backend 'plustek' is version 1.0.0

[dll] load: searching backend 'net' in 'usr/lib64/sane'

[dll] load: trying to load 'usr/lib64/sane/libsane-net.so.1'

[dll] load: dlopen()ing 'usr/lib64/sane/libsane-net.so.1'

[dll] init: initializing backend 'net'

[dll] init: backend 'net' is version 1.0.24

[dll] sane_get_devices: found 1 devices

[dll] sane_exit: exiting

[dll] sane_exit: calling backend 'plustek's' exit function

[dll] sane_exit: calling backend 'net's' exit function

[dll] sane_exit: finished

device 'plustek:libusb:001:002' is a Canon CanoScan N124OU/LIDE flatbed
scanner

 

Running scanimage -L a second time gives me:

 

[sanei_debug] Setting debug level of dll to 128.

[dll] sane_init: SANE dll backend version 1.0.13 from sane-backends 1.0.24

[dll] sane_init/read_dlld: attempting to open directory './dll.d'

[dll] sane_init/read_dlld: attempting to open directory '/etc/sane.d/dll.d'

[dll] sane_init/read_dlld: using config directory '/etc/sane.d/dll.d'

[dll] sane_init/read_dlld: done.

[dll] sane_init/read_config: reading dll.conf

[dll] add_backend: adding backend 'net'

[dll] add_backend: adding backend 'plustek'

[dll] sane_get_devices

[dll] load: searching backend 'plustek' in 'usr/lib64/sane'

[dll] load: trying to load 'usr/lib64/sane/libsane-plustek.so.1'

[dll] load: dlopen()ing 'usr/lib64/sane/libsane-plustek.so.1'

[dll] init: initializing backend 'plustek'

[dll] init: backend 'plustek' is version 1.0.0

[dll] load: searching backend 'net' in 'usr/lib64/sane'

[dll] load: trying to load 'usr/lib64/sane/libsane-net.so.1'

[dll] load: dlopen()ing 'usr/lib64/sane/libsane-net.so.1'

[dll] init: initializing backend 'net'

[dll] init: backend 'net' is version 1.0.24

[dll] sane_get_devices: found 0 devices

[dll] sane_exit: exiting

[dll] sane_exit: calling backend 'plustek's exit function

[dll] sane_exit: calling backend 'net's exit function

[dll] sane_exit: finished

 

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).

 

The only difference between the two is that the first time

[dll] sane_get_devices: found 1 devices

 

whereas the second

[dll] sane_get_devices: found 0 devices

 

???

 

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