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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