Comment 26 for bug 1541762

My system:
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=16.04
DISTRIB_CODENAME=xenial
DISTRIB_DESCRIPTION="Ubuntu 16.04.1 LTS
version: Ubuntu 4.4.0-45.66-generic 4.4.21
sane 1.0.14-1
sane-utils, libsane-common, libsane 1.0.26-git20160712-xenial0
xsane, xsane common 0.999-3ubuntu1
simple-scan 3.20.0-0ubuntu1

scanimage -L >debug_scanimage_L.log
[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:001:005'
[genesys] attach: device `libusb:001:005' successfully opened
[genesys] attach: found Canon flatbed scanner LiDE 220 at libusb:001:005
[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:001:005' was already in device list
[genesys] probe_genesys_devices: 1 devices currently attached
[genesys] probe_genesys_devices completed
[genesys] check_present: libusb:001:005 detected.
[genesys] sane_genesys_get_devices completed
[genesys] sane_genesys_exit start
[genesys] sane_genesys_exit completed