I have the following script for scanning:
xsane gt68xx:$(sane-find-scanner | grep GT-6801 | sed -e 's/.* at //')
Try this, and maybe try
strace -f -o log xsane gt68xx:libusb:...
where
sane-find-scanner | grep GT-6801 | sed -e 's/.* at //'
will help you filling dots. log will contain some data on system calls that failed.
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