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> If I have been using the scanner, then turn it off (without
> unloading the kernel module), if I try to access the
> scanner (i.e., running sane-find-scanner), I can no longer
> access it again (on or off) or unload the kernel module
> (Device or Resource Busy error) without a reboot.

This might be caused by the very long SCSI command timeout value (10
minutes) used until recently in Sane, so, waiting 10 minutes before
reloading the driver might help.

Abel