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scanimage -d 'brother5:bus4;dev1' --mode color -p --format=png > ~/$(echo "scan_$(date +%y-%m-%d_%H-%M-%S).png")
 

[jps@amd664 ~]$ scanimage -d 'brother5:bus4;dev1' --mode Gray -p --format=png > ~/tmp/$(echo "scan_$(date +%y-%m-%d_%H-%M-%S).png")
scanimage: rounded value of br-x from 215.9 to 215.88
scanimage: rounded value of br-y from 355.6 to 355.567
scanimage: sane_start: Invalid argument
[jps@amd664 ~]$ 
[jps@amd664 ~]$ ll tmp/scan*9.png
-rw-r--r-- 1 jps jps 0 juin  17 15:56 tmp/scan_20-06-17_15-56-09.png
[jps@amd664 ~]$ 

lsusb

scanimage -v -d 'brother5:usb:xxxx:yyyy' --mode gray -p --format=png > ~/tmp/$(echo "scan_$(date +%y-%m-%d_%H-%M-%S).png")

[jps@amd664 ~]$ lsusb
...
Bus 004 Device 040: ID 04f9:0468 Brother Industries, Ltd DS-640
...
[jps@amd664 ~]$ 
[jps@amd664 ~]$ scanimage -v -d 'brother5:usb:04f9:0468' --mode Gray -p --format=png > ~/tmp/$(echo "scan_$(date +%y-%m-%d_%H-%M-%S).png")
scanimage: open of device brother5:usb:04f9:0468 failed: Invalid argument
[jps@amd664 ~]$

brsaneconfig5 -d

[root@amd664 ~]# brsaneconfig5 -d
-----------------------------
cat /etc/fstab
# Entry for /dev/sda1 :
LABEL=Mageia_Slash / ext4 relatime,acl 1 1
# Entry for /dev/sdb2 :
UUID=c5709ee6-ac11-4024-b67e-a7c20ac46588 /VirtualBox\040VMs ext4 defaults 1 2
# Entry for /dev/sdb1 :
UUID=9811a0f0-2a90-424e-9014-05664184bb49 /home ext4 relatime,acl 1 2
# Entry for /dev/sdc1 :
UUID=835d0d31-4ce1-4473-882d-b373d27feb6b /home/jps/Musique ext4 relatime,acl 1 2
none /proc proc defaults 0 0
-----------------------------
sane-find-scanner
  # sane-find-scanner will now attempt to detect your scanner. If the
  # result is different from what you expected, first make sure your
  # scanner is powered up and properly connected to your computer.
  # No SCSI scanners found. If you expected something different, make sure that
  # you have loaded a kernel SCSI driver for your SCSI adapter.
  # Also you need support for SCSI Generic (sg) in your operating system.
  # If using Linux, try "modprobe sg".
found USB scanner (vendor=0x04f9 [Brother], product=0x0468 [DS-640]) at libusb:004:072
  # Your USB scanner was (probably) detected. It may or may not be supported by
  # SANE. Try scanimage -L and read the backend's manpage.
  # Not checking for parallel port scanners.
  # Most Scanners connected to the parallel port or other proprietary ports
  # can't be detected by this program.
-----------------------------
ls -R -all /proc/bus/usb
ls: impossible d'accéder à '/proc/bus/usb': Aucun fichier ou dossier de ce type
-----------------------------
cat /proc/bus/usb/devices
cat: /proc/bus/usb/devices: Aucun fichier ou dossier de ce type
-----------------------------
scanimage -L
device `brother5:bus4;dev1' is a Brother DS-640 USB scanner
device `v4l:/dev/video0' is a Noname UVC Camera (046d:081b) virtual device
-----------------------------
-----------------------------
ping
[root@amd664 ~]# 

su
modprobe sg
scanimage -v -d 'dsseries:usb:04f9:0468' --mode gray -p --format=png > ./output.png
 

[root@amd664 ~]# scanimage -v -d 'dsseries:usb:04f9:0468' --mode Gray -p --format=png > ./output.png
scanimage: open of device dsseries:usb:04f9:0468 failed: Invalid argument
[root@amd664 ~]#