/etc/sane.d/u12.conf is in libsane-common 1.0.27-1~experimental3ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 | # U12-SANE Backend configuration file
#
# each device needs at least two lines:
# - [usb] vendor-ID and product-ID
# - device devicename
# i.e. for Plustek (0x07B3) U1212 (0x0001)
# [usb] 0x07B3 0x0001
# device /dev/usbscanner
# or
# device libusb:bbb:ddd
# where bbb is the busnumber and ddd the device number
# make sure that your user has access to /proc/bus/usb/bbb/ddd
#
# additionally you can specify some options
# warmup, lOffOnEnd, lampOff
#
# For autodetection use
# [usb]
# device /dev/usbscanner
#
# or simply
# [usb]
#
# or if you want a specific device but you have no idea about the
# device node or you use libusb, simply set vendor- and product-ID
# [usb] 0x07B3 0x0001
# device auto
#
# NOTE: autodetection is safe, as it uses the info it got
# from the USB subsystem. If you're not using the
# autodetection, you MUST have attached that device
# at your USB-port, that you have specified...
#
[usb]
#
# options for the previous USB entry
#
# switch lamp off after xxx secs, 0 disables the feature
option lampOff 300
# warmup period in seconds, 0 means no warmup
option warmup 15
# 0 means leave lamp-status untouched, not 0 means switch off
# on sane_close
option lOffOnEnd 1
#
# for adjusting the default gamma values
#
#option redGamma 1.5
#option greenGamma 1.5
#option blueGamma 1.5
#option grayGamma 1.5
#
# and of course the device-name
#
device auto
#
# to define a new device, start with a new section:
# [usb]
#
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