export SANE_DEBUG_GENESYS_LOW=255
scanimage -L
[sanei_debug] Setting debug level of genesys to 255.
[genesys] SANE Genesys backend version 1.0 build 2511 from sane-backends 1.0.26git
[genesys] SANE Genesys backend built with libusb-1.0
[genesys] sane_init: authorize != null
[genesys] sane_init: little endian machine
[genesys] probe_genesys_devices start
[genesys] attach: start: devp != NULL, may_wait = 0
[genesys] attach: trying to open device `libusb:003:002'
[genesys] attach: device `libusb:003:002' successfully opened
[genesys] attach: found Canon flatbed scanner LiDE 220 at libusb:003:002
[genesys] attach completed
[genesys] probe_genesys_devices: 1 devices currently attached
[genesys] probe_genesys_devices completed
[genesys] sane_genesys_init completed
[genesys] sane_get_devices: start: local_only = false
[genesys] probe_genesys_devices start
[genesys] attach: start: devp != NULL, may_wait = 0
[genesys] attach: device `libusb:003:002' was already in device list
[genesys] probe_genesys_devices: 1 devices currently attached
[genesys] probe_genesys_devices completed
[genesys] check_present: libusb:003:002 detected.
[genesys] sane_genesys_get_devices completed
device `genesys:libusb:003:002' is a Canon LiDE 220 flatbed scanner
[genesys] sane_genesys_exit start
[genesys] sane_genesys_exit completed