Comment 7 for bug 465055

I have the same problem with my Canon Lide 50 since karmic
groening@Chris:~$ lsusb
Bus 004 Device 002: ID 046d:c051 Logitech, Inc. G3 (MX518) Optical Mouse
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 002: ID 04a9:2213 Canon, Inc. CanoScan LiDE 50/LiDE 35/LiDE 40
Bus 001 Device 003: ID 046d:08ce Logitech, Inc. QuickCam Pro 5000
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 002: ID 046a:0023 Cherry GmbH Cymotion Master Linux Keyboard
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

groening@Chris:~$ scanimage -L
WARNING: Unhandled message: interface=org.freedesktop.DBus.Introspectable, path=/, member=Introspect
device `v4l:/dev/video0' is a Noname UVC Camera (046d:08ce) virtual device
device `genesys:libusb:001:002' is a Canon LiDE 35/40/50 flatbed scanner

groening@Chris:~$ scanimage -d genesys:libusb:001:002
scanimage: sane_start: Error during device I/O