J'ai installé les bons pilotes depuis le depot AUR a savoir cnijfilter2-mg7700 et scangearmp2-mg7700
Le probleme c'est qu'apres installation de l'imprimante via CUPS impossible de scanner avec sane.
Code : Tout sélectionner
[quentin@quentin-pc ~]$ scanimage -L
device `v4l:/dev/video0' is a Noname USB2.0 UVC HD Webcam virtual device
[quentin@quentin-pc ~]$ sudo sane-find-scanner
[sudo] Mot de passe de quentin :
# 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=0x04a9 [Canon], product=0x178e [MG5700 series]) at libusb:002:003
# 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.
[quentin@quentin-pc ~]$ cnijlgmon3
direct cnijbe2://Canon/?port=usb&serial=00FCC4 "Canon MG5700 series" "USB Printer #1 with status readback for Canon IJ"
network cnijbe2://Canon/?port=net&serial=60-12-8B-13-B5-15 "Canon MG5700 series" "Canon-MG5700-series_60-12-8B-13-B5-15"
ça fait quelques temps que je me débat avec mais impossible de trouver une solution. 
Merci de votre aide !
Et bonne année !